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Issue packaging game

Each time i package the game i get this error, which is a little subdued in explaining what is causing the crash. Could anyone shed some light on this?

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: PerInstanceRenderData.IsValid() [File:D:/Build/++UE4/Sync/Engine/Source/Runtime/Engine/Private/InstancedStaticMesh.cpp] [Line: 1945]
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] 0x00007ffd60ee9129 KERNELBASE.dll!UnknownFunction ]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffd0a53a367 UE4Editor-Core.dll!UnknownFunction ]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffd0a53cbc4 UE4Editor-Core.dll!UnknownFunction ]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffd0a331ada UE4Editor-Core.dll!UnknownFunction ]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffd0a2867a3 UE4Editor-Core.dll!UnknownFunction ]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffd0a286eb0 UE4Editor-Core.dll!UnknownFunction ]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffce730c330 UE4Editor-Engine.dll!UnknownFunction ]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffce730bec6 UE4Editor-Engine.dll!UnknownFunction ]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffce729de24 UE4Editor-Engine.dll!UnknownFunction ]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffd09d31d62 UE4Editor-CoreUObject.dll!UnknownFunction ]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffd09d539d8 UE4Editor-CoreUObject.dll!UnknownFunction ]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffd09d3a771 UE4Editor-CoreUObject.dll!UnknownFunction ]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffce560795f UE4Editor-UnrealEd.dll!UnknownFunction ]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffce54b8ce4 UE4Editor-UnrealEd.dll!UnknownFunction ]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffce54bb263 UE4Editor-UnrealEd.dll!UnknownFunction ]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffce54c6303 UE4Editor-UnrealEd.dll!UnknownFunction ]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffce5339ea8 UE4Editor-UnrealEd.dll!UnknownFunction ]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffce536b366 UE4Editor-UnrealEd.dll!UnknownFunction ]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ff6cd415a93 UE4Editor-Cmd.exe!UnknownFunction ]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ff6cd40a667 UE4Editor-Cmd.exe!UnknownFunction ]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ff6cd40a9fa UE4Editor-Cmd.exe!UnknownFunction ]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ff6cd41b92c UE4Editor-Cmd.exe!UnknownFunction ]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ff6cd41d736 UE4Editor-Cmd.exe!UnknownFunction ]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffd63db7974 KERNEL32.DLL!UnknownFunction ]
UATHelper: Packaging (Windows (64-bit)): LogWindows: Error: [Callstack] 0x00007ffd6434a271 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: PerInstanceRenderData.IsValid() [File:D:/Build/++UE4/Sync/Engine/Source/Runtime/Engine/Private/InstancedStaticMesh.cpp] [Line: 1945]
PackagingResults: Error: [Callstack] 0x00007ffd60ee9129 KERNELBASE.dll!UnknownFunction ]
PackagingResults: Error: [Callstack] 0x00007ffd0a53a367 UE4Editor-Core.dll!UnknownFunction ]
PackagingResults: Error: [Callstack] 0x00007ffd0a53cbc4 UE4Editor-Core.dll!UnknownFunction ]
PackagingResults: Error: [Callstack] 0x00007ffd0a331ada UE4Editor-Core.dll!UnknownFunction ]
PackagingResults: Error: [Callstack] 0x00007ffd0a2867a3 UE4Editor-Core.dll!UnknownFunction ]
PackagingResults: Error: [Callstack] 0x00007ffd0a286eb0 UE4Editor-Core.dll!UnknownFunction ]
PackagingResults: Error: [Callstack] 0x00007ffce730c330 UE4Editor-Engine.dll!UnknownFunction ]
PackagingResults: Error: [Callstack] 0x00007ffce730bec6 UE4Editor-Engine.dll!UnknownFunction ]
PackagingResults: Error: [Callstack] 0x00007ffce729de24 UE4Editor-Engine.dll!UnknownFunction ]
PackagingResults: Error: [Callstack] 0x00007ffd09d31d62 UE4Editor-CoreUObject.dll!UnknownFunction ]
PackagingResults: Error: [Callstack] 0x00007ffd09d539d8 UE4Editor-CoreUObject.dll!UnknownFunction ]
PackagingResults: Error: [Callstack] 0x00007ffd09d3a771 UE4Editor-CoreUObject.dll!UnknownFunction ]
PackagingResults: Error: [Callstack] 0x00007ffce560795f UE4Editor-UnrealEd.dll!UnknownFunction ]
PackagingResults: Error: [Callstack] 0x00007ffce54b8ce4 UE4Editor-UnrealEd.dll!UnknownFunction ]
PackagingResults: Error: [Callstack] 0x00007ffce54bb263 UE4Editor-UnrealEd.dll!UnknownFunction ]
PackagingResults: Error: [Callstack] 0x00007ffce54c6303 UE4Editor-UnrealEd.dll!UnknownFunction ]
PackagingResults: Error: [Callstack] 0x00007ffce5339ea8 UE4Editor-UnrealEd.dll!UnknownFunction ]
PackagingResults: Error: [Callstack] 0x00007ffce536b366 UE4Editor-UnrealEd.dll!UnknownFunction ]
PackagingResults: Error: [Callstack] 0x00007ff6cd415a93 UE4Editor-Cmd.exe!UnknownFunction ]
PackagingResults: Error: [Callstack] 0x00007ff6cd40a667 UE4Editor-Cmd.exe!UnknownFunction ]
PackagingResults: Error: [Callstack] 0x00007ff6cd40a9fa UE4Editor-Cmd.exe!UnknownFunction ]
PackagingResults: Error: [Callstack] 0x00007ff6cd41b92c UE4Editor-Cmd.exe!UnknownFunction ]
PackagingResults: Error: [Callstack] 0x00007ff6cd41d736 UE4Editor-Cmd.exe!UnknownFunction ]
PackagingResults: Error: [Callstack] 0x00007ffd63db7974 KERNEL32.DLL!UnknownFunction ]
PackagingResults: Error: [Callstack] 0x00007ffd6434a271 ntdll.dll!UnknownFunction ]
PackagingResults: Error: end: stack for UAT
LogSlate: FSceneViewport::OnFocusLost() reason 0
UATHelper: Packaging (Windows (64-bit)): Took 21.704154s to run UE4Editor-Cmd.exe, ExitCode=3
UATHelper: Packaging (Windows (64-bit)): ERROR: Cook failed.
UATHelper: Packaging (Windows (64-bit)): (see C:\Users\MyComputer\AppData\Roaming\Unreal Engine\AutomationTool\Logs\E+Unreal+Engine+Versions+UE_4.23\Log.txt for full exception trace)
PackagingResults: Error: Cook failed.
UATHelper: Packaging (Windows (64-bit)): AutomationTool exiting with ExitCode=25 (Error_UnknownCookFailure)
UATHelper: Packaging (Windows (64-bit)): BUILD FAILED
PackagingResults: Error: Unknown Cook Failure
LogEditorSessionSummary: EditorSessionSummary sent report. Type=AbnormalShutdown, SessionId={F5EC2C12-4D78-6B30-84D6-EEADAC15EDB0}

Update - updating the engine fixed this problem