Hi, I just upgraded my project from UE5.5 to UE5.6 and everything works fine. Only after trying to package my project to a Windows Standalone App I realized something went wrong.
Everytime I try to package, doesn’t matter which configuration, it gives me this Error output:
UATHelper: Packaging (Windows): LogWindows: Error: appError called: Assertion failed: Index >= 0 [File:D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Public\UObject\UObjectArray.h] [Line: 1037]
UATHelper: Packaging (Windows): LogWindows: Error: begin: stack for UAT
UATHelper: Packaging (Windows): LogWindows: Error: === Critical error: ===
UATHelper: Packaging (Windows): LogWindows: Error:
UATHelper: Packaging (Windows): LogWindows: Error: Assertion failed: Index >= 0 [File:D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Public\UObject\UObjectArray.h] [Line: 1037]
UATHelper: Packaging (Windows): LogWindows: Error:
UATHelper: Packaging (Windows): LogWindows: Error:
UATHelper: Packaging (Windows): LogWindows: Error:
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffc15b24018 UnrealEditor-Core.dll!FDebug::CheckVerifyFailedImpl2() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:728]
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffc0a455324 UnrealEditor-Kismet.dll!UE::Private::GetAllImportedObjects'::
2’::FExternalReferenceFinder::operator<<() [D:\build++UE5\Sync\Engine\Source\Editor\Kismet\Private\Blueprints\BlueprintDependencies.cpp:170]
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffc24d68e9d UnrealEditor-CoreUObject.dll!FArchiveUObject::SerializeObjectPtr() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\Serialization\ArchiveUObject.cpp:92]
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffc15d0da62 UnrealEditor-Core.dll!FStructuredArchiveSlot::operator<<() [D:\build++UE5\Sync\Engine\Source\Runtime\Core\Private\Serialization\StructuredArchiveSlots.cpp:304]
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffc25160a1c UnrealEditor-CoreUObject.dll!FObjectProperty::SerializeItem() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\PropertyObject.cpp:180]
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffc24e399a4 UnrealEditor-CoreUObject.dll!UStruct::SerializeBin() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Class.cpp:1242]
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffc24e416ac UnrealEditor-CoreUObject.dll!UScriptStruct::SerializeItem() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Class.cpp:3365]
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffc251df9db UnrealEditor-CoreUObject.dll!FStructProperty::SerializeItem() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\PropertyStruct.cpp:170]
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffc24e399a4 UnrealEditor-CoreUObject.dll!UStruct::SerializeBin() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Class.cpp:1242]
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffc00147803 UnrealEditor-BlueprintGraph.dll!UK2Node_FunctionEntry::Serialize() [D:\build++UE5\Sync\Engine\Source\Editor\BlueprintGraph\Private\K2Node_FunctionEntry.cpp:280]
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffc0a4dd86a UnrealEditor-Kismet.dll!UE::Private::GetAllImportedObjects() [D:\build++UE5\Sync\Engine\Source\Editor\Kismet\Private\Blueprints\BlueprintDependencies.cpp:223]
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffc0a4dbcf2 UnrealEditor-Kismet.dll!UE::Private::GetAllDependencies() [D:\build++UE5\Sync\Engine\Source\Editor\Kismet\Private\Blueprints\BlueprintDependencies.cpp:287]
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffc0a4c677b UnrealEditor-Kismet.dll!UE::Private::GenerateBlueprintDependencies() [D:\build++UE5\Sync\Engine\Source\Editor\Kismet\Private\Blueprints\BlueprintDependencies.cpp:589]
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffc0a535528 UnrealEditor-Kismet.dll!UE::Private::BlueprintDependencies::RecordCookDependencies() [D:\build++UE5\Sync\Engine\Source\Editor\Kismet\Private\Blueprints\BlueprintDependencies.cpp:691]
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffc0cc8646b UnrealEditor-Engine.dll!UBlueprint::OnCookEvent() [D:\build++UE5\Sync\Engine\Source\Runtime\Engine\Private\Blueprint.cpp:959]
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffc252141fc UnrealEditor-CoreUObject.dll!UE::SavePackageUtilities::CallCookEventPlatformCookDependencies() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\SavePackage\SavePackageUtilities.cpp:701]
UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffc251d9b99 UnrealEditor-CoreUObject.dll!anonymous namespace'::RoutePresave() [D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\SavePackage2.cpp:288] UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffc251da21a UnrealEditor-CoreUObject.dll!UPackage::Save2() [D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\SavePackage2.cpp:3791] UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffc251da7a1 UnrealEditor-CoreUObject.dll!UPackage::Save() [D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\SavePackage.cpp:20] UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffc11cd91c5 UnrealEditor-UnrealEd.dll!UEditorEngine::Save() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\EditorEngine.cpp:4525] UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffc119f9898 UnrealEditor-UnrealEd.dll!UCookOnTheFlyServer::SaveCookedPackage() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\Cooker\CookSavePackage.cpp:126] UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffc12afc5bc UnrealEditor-UnrealEd.dll!UCookOnTheFlyServer::PumpRuntimeSaves() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\CookOnTheFlyServer.cpp:5053] UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffc12b0ba24 UnrealEditor-UnrealEd.dll!UCookOnTheFlyServer::TickMainCookLoop() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\CookOnTheFlyServer.cpp:1528] UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffc12b0b1ac UnrealEditor-UnrealEd.dll!UCookOnTheFlyServer::TickCookByTheBook() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\CookOnTheFlyServer.cpp:1408] UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffc11779940 UnrealEditor-UnrealEd.dll!UCookCommandlet::RunCookByTheBookCook() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\Commandlets\CookCommandlet.cpp:598] UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffc1173a69a UnrealEditor-UnrealEd.dll!UCookCommandlet::CookByTheBook() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\Commandlets\CookCommandlet.cpp:550] UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffc11756c83 UnrealEditor-UnrealEd.dll!UCookCommandlet::Main() [D:\build\++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\Commandlets\CookCommandlet.cpp:269] UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ff6e4248fa0 UnrealEditor-Cmd.exe!FEngineLoop::PreInitPostStartupScreen() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:3860] UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ff6e423e39c UnrealEditor-Cmd.exe!GuardedMain() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:143] UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ff6e423e6ba UnrealEditor-Cmd.exe!GuardedMainWrapper() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:128] UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ff6e424209e UnrealEditor-Cmd.exe!LaunchWindowsStartup() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:282] UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ff6e4254e44 UnrealEditor-Cmd.exe!WinMain() [D:\build\++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:339] UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ff6e4257466 UnrealEditor-Cmd.exe!__scrt_common_main_seh() [D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288] UATHelper: Packaging (Windows): LogWindows: Error: [Callstack] 0x00007ffc8020e8d7 KERNEL32.DLL!UnknownFunction [] UATHelper: Packaging (Windows): LogWindows: Error: UATHelper: Packaging (Windows): LogWindows: Error: end: stack for UAT PackagingResults: Error: appError called: Assertion failed: Index >= 0 [File:D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Public\UObject\UObjectArray.h] [Line: 1037] PackagingResults: Error: begin: stack for UAT PackagingResults: Error: === Critical error: === PackagingResults: Error: Assertion failed: Index >= 0 [File:D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Public\UObject\UObjectArray.h] [Line: 1037] PackagingResults: Error: [Callstack] 0x00007ffc15b24018 UnrealEditor-Core.dll!FDebug::CheckVerifyFailedImpl2() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Misc\AssertionMacros.cpp:728] PackagingResults: Error: [Callstack] 0x00007ffc0a455324 UnrealEditor-Kismet.dll!
UE::Private::GetAllImportedObjects’::2'::FExternalReferenceFinder::operator<<() [D:\build\++UE5\Sync\Engine\Source\Editor\Kismet\Private\Blueprints\BlueprintDependencies.cpp:170] PackagingResults: Error: [Callstack] 0x00007ffc24d68e9d UnrealEditor-CoreUObject.dll!FArchiveUObject::SerializeObjectPtr() [D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\Serialization\ArchiveUObject.cpp:92] PackagingResults: Error: [Callstack] 0x00007ffc15d0da62 UnrealEditor-Core.dll!FStructuredArchiveSlot::operator<<() [D:\build\++UE5\Sync\Engine\Source\Runtime\Core\Private\Serialization\StructuredArchiveSlots.cpp:304] PackagingResults: Error: [Callstack] 0x00007ffc25160a1c UnrealEditor-CoreUObject.dll!FObjectProperty::SerializeItem() [D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\PropertyObject.cpp:180] PackagingResults: Error: [Callstack] 0x00007ffc24e399a4 UnrealEditor-CoreUObject.dll!UStruct::SerializeBin() [D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Class.cpp:1242] PackagingResults: Error: [Callstack] 0x00007ffc24e416ac UnrealEditor-CoreUObject.dll!UScriptStruct::SerializeItem() [D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Class.cpp:3365] PackagingResults: Error: [Callstack] 0x00007ffc251df9db UnrealEditor-CoreUObject.dll!FStructProperty::SerializeItem() [D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\PropertyStruct.cpp:170] PackagingResults: Error: [Callstack] 0x00007ffc24e399a4 UnrealEditor-CoreUObject.dll!UStruct::SerializeBin() [D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Class.cpp:1242] PackagingResults: Error: [Callstack] 0x00007ffc00147803 UnrealEditor-BlueprintGraph.dll!UK2Node_FunctionEntry::Serialize() [D:\build\++UE5\Sync\Engine\Source\Editor\BlueprintGraph\Private\K2Node_FunctionEntry.cpp:280] PackagingResults: Error: [Callstack] 0x00007ffc0a4dd86a UnrealEditor-Kismet.dll!UE::Private::GetAllImportedObjects() [D:\build\++UE5\Sync\Engine\Source\Editor\Kismet\Private\Blueprints\BlueprintDependencies.cpp:223] PackagingResults: Error: [Callstack] 0x00007ffc0a4dbcf2 UnrealEditor-Kismet.dll!UE::Private::GetAllDependencies() [D:\build\++UE5\Sync\Engine\Source\Editor\Kismet\Private\Blueprints\BlueprintDependencies.cpp:287] PackagingResults: Error: [Callstack] 0x00007ffc0a4c677b UnrealEditor-Kismet.dll!UE::Private::GenerateBlueprintDependencies() [D:\build\++UE5\Sync\Engine\Source\Editor\Kismet\Private\Blueprints\BlueprintDependencies.cpp:589] PackagingResults: Error: [Callstack] 0x00007ffc0a535528 UnrealEditor-Kismet.dll!UE::Private::BlueprintDependencies::RecordCookDependencies() [D:\build\++UE5\Sync\Engine\Source\Editor\Kismet\Private\Blueprints\BlueprintDependencies.cpp:691] PackagingResults: Error: [Callstack] 0x00007ffc0cc8646b UnrealEditor-Engine.dll!UBlueprint::OnCookEvent() [D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\Blueprint.cpp:959] PackagingResults: Error: [Callstack] 0x00007ffc252141fc UnrealEditor-CoreUObject.dll!UE::SavePackageUtilities::CallCookEventPlatformCookDependencies() [D:\build\++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\SavePackage\SavePackageUtilities.cpp:701] PackagingResults: Error: [Callstack] 0x00007ffc251d9b99 UnrealEditor-CoreUObject.dll!
anonymous namespace’::RoutePresave() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\SavePackage2.cpp:288]
PackagingResults: Error: [Callstack] 0x00007ffc251da21a UnrealEditor-CoreUObject.dll!UPackage::Save2() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\SavePackage2.cpp:3791]
PackagingResults: Error: [Callstack] 0x00007ffc251da7a1 UnrealEditor-CoreUObject.dll!UPackage::Save() [D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\SavePackage.cpp:20]
PackagingResults: Error: [Callstack] 0x00007ffc11cd91c5 UnrealEditor-UnrealEd.dll!UEditorEngine::Save() [D:\build++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\EditorEngine.cpp:4525]
PackagingResults: Error: [Callstack] 0x00007ffc119f9898 UnrealEditor-UnrealEd.dll!UCookOnTheFlyServer::SaveCookedPackage() [D:\build++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\Cooker\CookSavePackage.cpp:126]
PackagingResults: Error: [Callstack] 0x00007ffc12afc5bc UnrealEditor-UnrealEd.dll!UCookOnTheFlyServer::PumpRuntimeSaves() [D:\build++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\CookOnTheFlyServer.cpp:5053]
PackagingResults: Error: [Callstack] 0x00007ffc12b0ba24 UnrealEditor-UnrealEd.dll!UCookOnTheFlyServer::TickMainCookLoop() [D:\build++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\CookOnTheFlyServer.cpp:1528]
PackagingResults: Error: [Callstack] 0x00007ffc12b0b1ac UnrealEditor-UnrealEd.dll!UCookOnTheFlyServer::TickCookByTheBook() [D:\build++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\CookOnTheFlyServer.cpp:1408]
PackagingResults: Error: [Callstack] 0x00007ffc11779940 UnrealEditor-UnrealEd.dll!UCookCommandlet::RunCookByTheBookCook() [D:\build++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\Commandlets\CookCommandlet.cpp:598]
PackagingResults: Error: [Callstack] 0x00007ffc1173a69a UnrealEditor-UnrealEd.dll!UCookCommandlet::CookByTheBook() [D:\build++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\Commandlets\CookCommandlet.cpp:550]
PackagingResults: Error: [Callstack] 0x00007ffc11756c83 UnrealEditor-UnrealEd.dll!UCookCommandlet::Main() [D:\build++UE5\Sync\Engine\Source\Editor\UnrealEd\Private\Commandlets\CookCommandlet.cpp:269]
PackagingResults: Error: [Callstack] 0x00007ff6e4248fa0 UnrealEditor-Cmd.exe!FEngineLoop::PreInitPostStartupScreen() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\LaunchEngineLoop.cpp:3860]
PackagingResults: Error: [Callstack] 0x00007ff6e423e39c UnrealEditor-Cmd.exe!GuardedMain() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\Launch.cpp:143]
PackagingResults: Error: [Callstack] 0x00007ff6e423e6ba UnrealEditor-Cmd.exe!GuardedMainWrapper() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:128]
PackagingResults: Error: [Callstack] 0x00007ff6e424209e UnrealEditor-Cmd.exe!LaunchWindowsStartup() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:282]
PackagingResults: Error: [Callstack] 0x00007ff6e4254e44 UnrealEditor-Cmd.exe!WinMain() [D:\build++UE5\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp:339]
PackagingResults: Error: [Callstack] 0x00007ff6e4257466 UnrealEditor-Cmd.exe!__scrt_common_main_seh() [D:\a_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288]
PackagingResults: Error: [Callstack] 0x00007ffc8020e8d7 KERNEL32.DLL!UnknownFunction
PackagingResults: Error: end: stack for UAT
Does anyone have an idea why that happens? I didn’t really change anything except upgrading from UE5.5 to UE5.6.