[4.27] When you want to launch game button try too cook a blueprint and says "class is not mapped when saving"

I need help about this error fix when i want to launch.

Error Details:

Assertion failed: !Export.ClassIndex.IsNull() [File:D:/Build/++UE4/Sync/Engine/Source/Runtime/CoreUObject/Private/UObject/SavePackage.cpp] [Line: 3807] Export SKEL_Hat_NPC_Player_RiftCollapse_Trail_C /Game/AHITAssets/Blueprints/NPC/Hat_NPC_Player_RiftCollapse_Trail.Default__SKEL_Hat_NPC_Player_RiftCollapse_Trail_C class is not mapped when saving /Game/AHITAssets/Blueprints/NPC/Hat_NPC_Player_RiftCollapse_Trail

UE4Editor_Core!AssertFailedImplV() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:104]
UE4Editor_Core!FDebug::CheckVerifyFailedImpl() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:461]
UE4Editor_CoreUObject!DispatchCheckVerify<void,<lambda_2369ee982cba829c42befb5ad22b6d98> >() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Core\Public\Misc\AssertionMacros.h:164]
UE4Editor_CoreUObject!UPackage::Save() [D:\Build\++UE4\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\SavePackage.cpp:3807]
UE4Editor_UnrealEd!UEditorEngine::Save() [D:\Build\++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\EditorEngine.cpp:4622]
UE4Editor_UnrealEd!UCookOnTheFlyServer::SaveCookedPackage() [D:\Build\++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\CookOnTheFlyServer.cpp:3534]
UE4Editor_UnrealEd!UCookOnTheFlyServer::PumpSaves() [D:\Build\++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\CookOnTheFlyServer.cpp:2359]
UE4Editor_UnrealEd!UCookOnTheFlyServer::TickCookOnTheSide() [D:\Build\++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\CookOnTheFlyServer.cpp:1165]
UE4Editor_UnrealEd!UCookOnTheFlyServer::Tick() [D:\Build\++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\CookOnTheFlyServer.cpp:484]
UE4Editor_UnrealEd!FTickableEditorObject::TickObjects() [D:\Build\++UE4\Sync\Engine\Source\Editor\UnrealEd\Public\TickableEditorObject.h:45]
UE4Editor_UnrealEd!UEditorEngine::Tick() [D:\Build\++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\EditorEngine.cpp:1502]
UE4Editor_UnrealEd!UUnrealEdEngine::Tick() [D:\Build\++UE4\Sync\Engine\Source\Editor\UnrealEd\Private\UnrealEdEngine.cpp:426]
UE4Editor!FEngineLoop::Tick() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:4921]
UE4Editor!GuardedMain() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:178]
UE4Editor!GuardedMainWrapper() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:137]
UE4Editor!LaunchWindowsStartup() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:273]
UE4Editor!WinMain() [D:\Build\++UE4\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:320]
UE4Editor!__scrt_common_main_seh() [d:\agent\_work\5\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
kernel32
ntdll

Help me someone pls.