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My project crash everytimes.....

When I open my project if I want to open a blueprint or to play my game, it crash.
I don’t have any backup… :
The crash message is :

MachineId:454E2D2847F48BB84F031F8A9B104BE2
EpicAccountId:ff451ea13aa0432eb9946e7c1db2a47b

Fatal error: [File:D:\Build++UE4+Release-4.14+Compile\Sync\Engine\Source\Runtime\CoreUObject\Private\Templates\Casts.cpp] [Line: 11]
Cast of LinkerPlaceholderExportObject /Game/ThirdPersonBP/Blueprints/BP_FloorTile.BP_FloorTile_C:NODE_AddChildActorComponent-0.NODE_AddChildActorComponent-0_BP_Blocker_C_CAT to Actor failed

UE4Editor_Core!FDebug::AssertFailed() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\core\private\misc\assertionmacros.cpp:332]
UE4Editor_CoreUObject!CastLogError() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private emplates\casts.cpp:12]
UE4Editor_Engine!CastChecked<AActor,UObject>() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\public emplates\casts.h:203]
UE4Editor_Engine!UChildActorComponent::Serialize() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\engine\private\components\childactorcomponent.cpp:91]
UE4Editor_CoreUObject!FLinkerLoad::Preload() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3414]
UE4Editor_CoreUObject!FLinkerLoad::CreateExportAndPreload() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2890]
UE4Editor_CoreUObject!FLinkerLoad::LoadAllObjects() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3023]
UE4Editor_CoreUObject!LoadPackageInternalInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1271]
UE4Editor_CoreUObject!LoadPackageInternal() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1423]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2561]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2327]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2609]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2327]
UE4Editor_CoreUObject!FLinkerLoad::CreateImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:4257]
UE4Editor_CoreUObject!FLinkerLoad::ResolveDependencyPlaceholder() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\blueprint\blueprintsupport.cpp:1090]
UE4Editor_CoreUObject!FLinkerLoad::ResolveDeferredDependencies() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\blueprint\blueprintsupport.cpp:892]
UE4Editor_CoreUObject!FLinkerLoad::ResolveAllImports() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\blueprint\blueprintsupport.cpp:1181]
UE4Editor_CoreUObject!FLinkerLoad::FinalizeBlueprint() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\blueprint\blueprintsupport.cpp:1284]
UE4Editor_CoreUObject!FLinkerLoad::Preload() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3461]
UE4Editor_CoreUObject!FLinkerLoad::CreateExport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:4111]
UE4Editor_CoreUObject!FLinkerLoad::IndexToObject() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:4334]
UE4Editor_CoreUObject!FLinkerLoad::CreateExport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3807]
UE4Editor_CoreUObject!FLinkerLoad::CreateExportAndPreload() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2884]
UE4Editor_CoreUObject!FLinkerLoad::LoadAllObjects() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3023]
UE4Editor_CoreUObject!LoadPackageInternalInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1271]
UE4Editor_CoreUObject!LoadPackageInternal() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1423]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2561]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2327]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2609]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2327]
UE4Editor_CoreUObject!FLinkerLoad::GetExportLoadClass() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2912]
UE4Editor_CoreUObject!FLinkerLoad::CreateExport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3636]
UE4Editor_CoreUObject!FLinkerLoad::CreateExportAndPreload() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2884]
UE4Editor_CoreUObject!FLinkerLoad::LoadAllObjects() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3023]
UE4Editor_CoreUObject!LoadPackageInternalInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1271]
UE4Editor_CoreUObject!LoadPackageInternal() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1423]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2561]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2327]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2609]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2327]
UE4Editor_CoreUObject!FLinkerLoad::CreateImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:4257]
UE4Editor_CoreUObject!FLinkerLoad::ResolveDependencyPlaceholder() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\blueprint\blueprintsupport.cpp:1090]
UE4Editor_CoreUObject!FLinkerLoad::ResolveDeferredDependencies() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\blueprint\blueprintsupport.cpp:892]
UE4Editor_CoreUObject!FLinkerLoad::ResolveAllImports() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\blueprint\blueprintsupport.cpp:1181]
UE4Editor_CoreUObject!FLinkerLoad::FinalizeBlueprint() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\blueprint\blueprintsupport.cpp:1284]
UE4Editor_CoreUObject!FLinkerLoad::Preload() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3461]
UE4Editor_CoreUObject!FLinkerLoad::CreateExport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:4111]
UE4Editor_CoreUObject!FLinkerLoad::IndexToObject() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:4334]
UE4Editor_CoreUObject!FLinkerLoad::CreateExport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3807]
UE4Editor_CoreUObject!FLinkerLoad::CreateExportAndPreload() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2884]
UE4Editor_CoreUObject!FLinkerLoad::LoadAllObjects() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3023]
UE4Editor_CoreUObject!LoadPackageInternalInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1271]
UE4Editor_CoreUObject!LoadPackageInternal() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1423]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2561]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2327]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2609]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2327]
UE4Editor_CoreUObject!FLinkerLoad::GetExportLoadClass() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2912]
UE4Editor_CoreUObject!FLinkerLoad::CreateExport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3636]
UE4Editor_CoreUObject!FLinkerLoad::CreateExportAndPreload() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2884]
UE4Editor_CoreUObject!FLinkerLoad::LoadAllObjects() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3023]
UE4Editor_CoreUObject!LoadPackageInternalInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1271]
UE4Editor_CoreUObject!LoadPackageInternal() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1423]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2561]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2327]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2609]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2327]
UE4Editor_CoreUObject!FLinkerLoad::CreateImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:4257]
UE4Editor_CoreUObject!FLinkerLoad::ResolveDependencyPlaceholder() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\blueprint\blueprintsupport.cpp:1090]
UE4Editor_CoreUObject!FLinkerLoad::ResolveDeferredDependencies() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\blueprint\blueprintsupport.cpp:950]
UE4Editor_CoreUObject!FLinkerLoad::Preload() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3461]
UE4Editor_CoreUObject!FLinkerLoad::CreateExport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:4111]
UE4Editor_CoreUObject!FLinkerLoad::IndexToObject() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:4334]
UE4Editor_CoreUObject!FLinkerLoad::CreateExport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3807]
UE4Editor_CoreUObject!FLinkerLoad::CreateExportAndPreload() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2884]
UE4Editor_CoreUObject!FLinkerLoad::LoadAllObjects() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3023]
UE4Editor_CoreUObject!LoadPackageInternalInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1271]
UE4Editor_CoreUObject!LoadPackageInternal() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1423]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2561]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2327]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2609]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2327]
UE4Editor_CoreUObject!FLinkerLoad::CreateImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:4257]
UE4Editor_CoreUObject!FLinkerLoad::ResolveDependencyPlaceholder() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\blueprint\blueprintsupport.cpp:1090]
UE4Editor_CoreUObject!FLinkerLoad::ResolveDeferredDependencies() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\blueprint\blueprintsupport.cpp:950]
UE4Editor_CoreUObject!FLinkerLoad::Preload() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3461]
UE4Editor_CoreUObject!FLinkerLoad::CreateExport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:4111]
UE4Editor_CoreUObject!FLinkerLoad::IndexToObject() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:4334]
UE4Editor_CoreUObject!FLinkerLoad::CreateExport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3807]
UE4Editor_CoreUObject!FLinkerLoad::IndexToObject() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:4334]
UE4Editor_CoreUObject!FLinkerLoad::CreateExport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3807]
UE4Editor_CoreUObject!FLinkerLoad::CreateExportAndPreload() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2884]
UE4Editor_CoreUObject!FLinkerLoad::LoadAllObjects() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:3023]
UE4Editor_CoreUObject!LoadPackageInternalInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1271]
UE4Editor_CoreUObject!LoadPackageInternal() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1423]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2561]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2327]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2609]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2327]
UE4Editor_CoreUObject!FLinkerLoad::Verify() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2105]
UE4Editor_CoreUObject!FLinkerLoad::FinalizeCreation() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2015]
UE4Editor_CoreUObject!FLinkerLoad::Tick() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:699]
UE4Editor_CoreUObject!FLinkerLoad::CreateLinker() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:404]
UE4Editor_CoreUObject!GetPackageLinker() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linker.cpp:657]
UE4Editor_CoreUObject!LoadPackageInternalInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1196]
UE4Editor_CoreUObject!LoadPackageInternal() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1423]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2561]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2327]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2609]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2327]
UE4Editor_CoreUObject!FLinkerLoad::Verify() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2105]
UE4Editor_CoreUObject!FLinkerLoad::FinalizeCreation() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2015]
UE4Editor_CoreUObject!FLinkerLoad::Tick() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:699]
UE4Editor_CoreUObject!FLinkerLoad::CreateLinker() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:404]
UE4Editor_CoreUObject!GetPackageLinker() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linker.cpp:657]
UE4Editor_CoreUObject!LoadPackageInternalInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1196]
UE4Editor_CoreUObject!LoadPackageInternal() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1423]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2561]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2327]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2609]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2327]
UE4Editor_CoreUObject!FLinkerLoad::Verify() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2105]
UE4Editor_CoreUObject!FLinkerLoad::FinalizeCreation() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2015]
UE4Editor_CoreUObject!FLinkerLoad::Tick() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:699]
UE4Editor_CoreUObject!FLinkerLoad::CreateLinker() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:404]
UE4Editor_CoreUObject!GetPackageLinker() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linker.cpp:657]
UE4Editor_CoreUObject!LoadPackageInternalInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1196]
UE4Editor_CoreUObject!LoadPackageInternal() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1423]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2561]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2327]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImportInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2609]
UE4Editor_CoreUObject!FLinkerLoad::VerifyImport() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2327]
UE4Editor_CoreUObject!FLinkerLoad::Verify() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2105]
UE4Editor_CoreUObject!FLinkerLoad::FinalizeCreation() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:2015]
UE4Editor_CoreUObject!FLinkerLoad::Tick() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:699]
UE4Editor_CoreUObject!FLinkerLoad::CreateLinker() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linkerload.cpp:404]
UE4Editor_CoreUObject!GetPackageLinker() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\linker.cpp:657]
UE4Editor_CoreUObject!LoadPackageInternalInner() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1196]
UE4Editor_CoreUObject!LoadPackage() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:1437]
UE4Editor_CoreUObject!ResolveName() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:722]
UE4Editor_CoreUObject!StaticLoadObjectInternal() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:809]
UE4Editor_CoreUObject!StaticLoadObject() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:869]
UE4Editor_CoreUObject!StaticLoadClass() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\coreuobject\private\uobject\uobjectglobals.cpp:893]
UE4Editor_Engine!UGameInstance::CreateGameModeForURL() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\engine\private\gameinstance.cpp:992]
UE4Editor_Engine!UWorld::SetGameMode() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\engine\private\world.cpp:3168]
UE4Editor_Engine!UGameInstance::StartPIEGameInstance() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\engine\private\gameinstance.cpp:242]
UE4Editor_UnrealEd!UEditorEngine::CreatePIEGameInstance() [d:\build++ue4+release-4.14+compile\sync\engine\source\editor\unrealed\private\playlevel.cpp:3358]
UE4Editor_UnrealEd!UEditorEngine::PlayInEditor() [d:\build++ue4+release-4.14+compile\sync\engine\source\editor\unrealed\private\playlevel.cpp:2462]
UE4Editor_UnrealEd!UEditorEngine::StartQueuedPlayMapRequest() [d:\build++ue4+release-4.14+compile\sync\engine\source\editor\unrealed\private\playlevel.cpp:1160]
UE4Editor_UnrealEd!UEditorEngine::Tick() [d:\build++ue4+release-4.14+compile\sync\engine\source\editor\unrealed\private\editorengine.cpp:1320]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() [d:\build++ue4+release-4.14+compile\sync\engine\source\editor\unrealed\private\unrealedengine.cpp:371]
UE4Editor!FEngineLoop::Tick() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\launchengineloop.cpp:2859]
UE4Editor!GuardedMain() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\launch.cpp:152]
UE4Editor!GuardedMainWrapper() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:126]
UE4Editor!WinMain() [d:\build++ue4+release-4.14+compile\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:202]
UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:264]
kernel32

Thanks for reading !

IIRC someone (Epic staff?) said it was a good idea to remove the Epic account ID.

I suggest copying the “BP_FloorTile” to another folder and then deleting the blueprint and see if that helps.

Is this a C++ or Blueprint only project?

HTH