Please help! i cant package my project and i have no idea why?

Development Platform & Builds
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UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: begin: stack for UAT
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: === Critical error: ===
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error:
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: Assertion failed: NULL != GeneratedClass [File:D:\Build++UE4+Release-4.19+Compile\Sync\Engine\Source\Runtime\Engine\Private\Blueprint.cpp] [Line: 743]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error:
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error:
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error:
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x000000001F1EA388 KERNELBASE.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x0000000008C77884 UE4Editor-ApplicationCore.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000F0B66D9B UE4Editor-Core.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000F0AA1949 UE4Editor-Core.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000DFADC7BB UE4Editor-Engine.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000F360024D UE4Editor-CoreUObject.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000F36CAFAC UE4Editor-CoreUObject.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000F36E312B UE4Editor-CoreUObject.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000F36E2544 UE4Editor-CoreUObject.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000EE993F83 UE4Editor-UnrealEd.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000EE9CB05B UE4Editor-UnrealEd.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000EE87A580 UE4Editor-UnrealEd.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000EE8A1CB0 UE4Editor-UnrealEd.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000D8CCEB20 UE4Editor-Cmd.exe!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000D8CC69FA UE4Editor-Cmd.exe!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000D8CC6C4A UE4Editor-Cmd.exe!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000D8CD4177 UE4Editor-Cmd.exe!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00000000D8CD4FBF UE4Editor-Cmd.exe!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x0000000022833034 KERNEL32.DLL!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x0000000022BB1431 ntdll.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x0000000022BB1431 ntdll.dll!UnknownFunction []
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error:
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: end: stack for UAT
PackagingResults: Error: begin: stack for UAT
PackagingResults: Error: === Critical error: ===
PackagingResults: Error: Assertion failed: NULL != GeneratedClass [File:D:\Build++UE4+Release-4.19+Compile\Sync\Engine\Source\Runtime\Engine\Private\Blueprint.cpp] [Line: 743]
PackagingResults: Error: [Callstack] 0x000000001F1EA388 KERNELBASE.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x0000000008C77884 UE4Editor-ApplicationCore.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000F0B66D9B UE4Editor-Core.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000F0AA1949 UE4Editor-Core.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000DFADC7BB UE4Editor-Engine.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000F360024D UE4Editor-CoreUObject.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000F36CAFAC UE4Editor-CoreUObject.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000F36E312B UE4Editor-CoreUObject.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000F36E2544 UE4Editor-CoreUObject.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000EE993F83 UE4Editor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000EE9CB05B UE4Editor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000EE87A580 UE4Editor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000EE8A1CB0 UE4Editor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000D8CCEB20 UE4Editor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000D8CC69FA UE4Editor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000D8CC6C4A UE4Editor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000D8CD4177 UE4Editor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00000000D8CD4FBF UE4Editor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x0000000022833034 KERNEL32.DLL!UnknownFunction []
PackagingResults: Error: [Callstack] 0x0000000022BB1431 ntdll.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x0000000022BB1431 ntdll.dll!UnknownFunction []
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMultiByProfile.End
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMultiForObjects.End
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceSingle.End
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceSingleByProfile.End
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceSingleForObjects.End
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or StructProperty /Script/Engine.KismetSystemLibrary:CapsuleTraceMulti.End
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or StructProperty /Script/Engine.KismetSystemLibrary:CapsuleTraceMultiByProfile.End
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or StructProperty /Script/Engine.KismetSystemLibrary:CapsuleTraceMultiForObjects.End
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or StructProperty /Script/Engine.KismetSystemLibrary:CapsuleTraceSingle.End
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or StructProperty /Script/Engine.KismetSystemLibrary:CapsuleTraceSingleByProfile.End
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or StructProperty /Script/Engine.KismetSystemLibrary:CapsuleTraceSingleForObjects.End
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or StructProperty /Script/Engine.KismetSystemLibrary:DrawDebugCylinder.End
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or StructProperty /Script/Engine.KismetSystemLibrary:LineTraceMulti.End
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or StructProperty /Script/Engine.KismetSystemLibrary:LineTraceMultiByProfile.End
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or StructProperty /Script/Engine.KismetSystemLibrary:LineTraceMultiForObjects.End
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or StructProperty /Script/Engine.KismetSystemLibrary:LineTraceSingle.End
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or StructProperty /Script/Engine.KismetSystemLibrary:LineTraceSingleByProfile.End
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or StructProperty /Script/Engine.KismetSystemLibrary:LineTraceSingleForObjects.End
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or StructProperty /Script/Engine.KismetSystemLibrary:SphereTraceMulti.End
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or StructProperty /Script/Engine.KismetSystemLibrary:SphereTraceMultiByProfile.End
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or StructProperty /Script/Engine.KismetSystemLibrary:SphereTraceMultiForObjects.End
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or StructProperty /Script/Engine.KismetSystemLibrary:SphereTraceSingle.End
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or StructProperty /Script/Engine.KismetSystemLibrary:SphereTraceSingleByProfile.End
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or StructProperty /Script/Engine.KismetSystemLibrary:SphereTraceSingleForObjects.End
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or BoolProperty /Script/Landscape.LandscapeSplineConnection:End
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or StructProperty /Script/Engine.BatchedLine:End
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or StructProperty /Script/AIModule.NavLocalGridManager:FindLocalNavigationGridPath.End
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or StructProperty /Script/FunctionalTesting.FunctionalTestUtilityLibrary:TraceChannelTestUtil.End
PackagingResults: Error: end: stack for UAT
UATHelper: Packaging (Windows (64-bit)): Took 189.3490655s to run UE4Editor-Cmd.exe, ExitCode=3
UATHelper: Packaging (Windows (64-bit)): ERROR: Cook failed.
UATHelper: Packaging (Windows (64-bit)): (see C:\Users\michael schade\AppData\Roaming\Unreal Engine\AutomationTool\Logs\D+unreal+engine+engine+UE_4.19\UAT_Log.txt for full exception trace)
UATHelper: Packaging (Windows (64-bit)): AutomationTool exiting with ExitCode=25 (Error_UnknownCookFailure)
UATHelper: Packaging (Windows (64-bit)): BUILD FAILED
PackagingResults: Error: Cook failed.
PackagingResults: Error: Unknown Cook Failure

2

I have this error too! It started when I upgraded my project to UE4.19 from UE4.18.

3

I solved this problem! Turned out it was a corrupted blueprint. Go through all blueprint opening them 1 by 1 until one of them crashed the editor.