Packaging Error?

Hello,

When i tried packaging i got this error.

UATHelper: Cooking (Windows):   LogShaderCompilers: Display: Shaders left to compile 2084
UATHelper: Cooking (Windows):   LogWindows: Error: begin: stack for UAT
UATHelper: Cooking (Windows):   LogWindows: Error: === Critical error: ===
UATHelper: Cooking (Windows):   LogWindows: Error:
UATHelper: Cooking (Windows):   LogWindows: Error: Fatal error!
UATHelper: Cooking (Windows):   LogWindows: Error:
UATHelper: Cooking (Windows):   LogWindows: Error: Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x00000008
UATHelper: Cooking (Windows):   LogWindows: Error:
UATHelper: Cooking (Windows):   LogWindows: Error: [Callstack] 0x00007ffa5319c181 UE4Editor-Landscape.dll!UnknownFunction []
UATHelper: Cooking (Windows):   LogWindows: Error: [Callstack] 0x00007ffa53117263 UE4Editor-Landscape.dll!UnknownFunction []
UATHelper: Cooking (Windows):   LogWindows: Error: [Callstack] 0x00007ffa53111aa2 UE4Editor-Landscape.dll!UnknownFunction []
UATHelper: Cooking (Windows):   LogWindows: Error: [Callstack] 0x00007ffa531118a4 UE4Editor-Landscape.dll!UnknownFunction []
UATHelper: Cooking (Windows):   LogWindows: Error: [Callstack] 0x00007ffa5bb13345 UE4Editor-CoreUObject.dll!UnknownFunction []
UATHelper: Cooking (Windows):   LogWindows: Error: [Callstack] 0x00007ffa5bbfb7a1 UE4Editor-CoreUObject.dll!UnknownFunction []
UATHelper: Cooking (Windows):   LogWindows: Error: [Callstack] 0x00007ffa5bc162c4 UE4Editor-CoreUObject.dll!UnknownFunction []
UATHelper: Cooking (Windows):   LogWindows: Error: [Callstack] 0x00007ffa5bc154b9 UE4Editor-CoreUObject.dll!UnknownFunction []
UATHelper: Cooking (Windows):   LogWindows: Error: [Callstack] 0x00007ffa564f0b3c UE4Editor-UnrealEd.dll!UnknownFunction []
UATHelper: Cooking (Windows):   LogWindows: Error: [Callstack] 0x00007ffa5653553d UE4Editor-UnrealEd.dll!UnknownFunction []
UATHelper: Cooking (Windows):   LogWindows: Error: [Callstack] 0x00007ffa563a7a8d UE4Editor-UnrealEd.dll!UnknownFunction []
UATHelper: Cooking (Windows):   LogWindows: Error: [Callstack] 0x00007ffa563d88ff UE4Editor-UnrealEd.dll!UnknownFunction []
UATHelper: Cooking (Windows):   LogWindows: Error: [Callstack] 0x00007ff67149e9c2 UE4Editor-Cmd.exe!UnknownFunction []
UATHelper: Cooking (Windows):   LogWindows: Error: [Callstack] 0x00007ff671495968 UE4Editor-Cmd.exe!UnknownFunction []
UATHelper: Cooking (Windows):   LogWindows: Error: [Callstack] 0x00007ff671495bba UE4Editor-Cmd.exe!UnknownFunction []
UATHelper: Cooking (Windows):   LogWindows: Error: [Callstack] 0x00007ff6714a3dac UE4Editor-Cmd.exe!UnknownFunction []
UATHelper: Cooking (Windows):   LogWindows: Error: [Callstack] 0x00007ff6714a4ce6 UE4Editor-Cmd.exe!UnknownFunction []
UATHelper: Cooking (Windows):   LogWindows: Error: [Callstack] 0x00007ffabe733034 KERNEL32.DLL!UnknownFunction []
UATHelper: Cooking (Windows):   LogWindows: Error: [Callstack] 0x00007ffabec21461 ntdll.dll!UnknownFunction []
UATHelper: Cooking (Windows):   LogWindows: Error:
UATHelper: Cooking (Windows):   LogWindows: Error: end: stack for UAT
PackagingResults: Error: begin: stack for UAT
PackagingResults: Error: === Critical error: ===
PackagingResults: Error: Fatal error!
PackagingResults: Error: Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x00000008
PackagingResults: Error: [Callstack] 0x00007ffa5319c181 UE4Editor-Landscape.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffa53117263 UE4Editor-Landscape.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffa53111aa2 UE4Editor-Landscape.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffa531118a4 UE4Editor-Landscape.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffa5bb13345 UE4Editor-CoreUObject.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffa5bbfb7a1 UE4Editor-CoreUObject.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffa5bc162c4 UE4Editor-CoreUObject.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffa5bc154b9 UE4Editor-CoreUObject.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffa564f0b3c UE4Editor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffa5653553d UE4Editor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffa563a7a8d UE4Editor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffa563d88ff UE4Editor-UnrealEd.dll!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ff67149e9c2 UE4Editor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ff671495968 UE4Editor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ff671495bba UE4Editor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ff6714a3dac UE4Editor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ff6714a4ce6 UE4Editor-Cmd.exe!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffabe733034 KERNEL32.DLL!UnknownFunction []
PackagingResults: Error: [Callstack] 0x00007ffabec21461 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
LogUObjectHash: Warning: Ambiguous search, could be StructProperty /Script/Engine.KismetSystemLibrary:BoxTraceMulti.End or StructProperty /Script/MeshEditor.OverlayLine:End
PackagingResults: Error: end: stack for UAT
UATHelper: Cooking (Windows): Took 80,2247488s to run UE4Editor-Cmd.exe, ExitCode=3
UATHelper: Cooking (Windows): ERROR: Cook failed.
UATHelper: Cooking (Windows):        (see C:\Users\onurh\AppData\Roaming\Unreal Engine\AutomationTool\Logs\E+UnrealEngine4.20+UE_4.20\Log.txt for full exception trace)
UATHelper: Cooking (Windows): AutomationTool exiting with ExitCode=25 (Error_UnknownCookFailure)
UATHelper: Cooking (Windows): BUILD FAILED
PackagingResults: Error: Cook failed.
LogSlate: Took 0.000203 seconds to synchronously load lazily loaded font '../../../Engine/Content/Slate/Fonts/DroidSansMono.ttf' (77K)

How can i solve this problem ?