Assertion Failed: AsyncLoading.cpp, Line 3710

Reach_Adrian
Sat, 20 Jun 2020 10:56:28 +0000
Platform & Builds

Hi everyone,

This is really strange, getting the following error when I attempt to load a packaged build of our game:

Assertion failed: Object->IsValidLowLevelFast()

[File:D:/Build/++UE4+Licensee/Sync/Engine/Source/Runtime/CoreUObject/Private/Serialization/AsyncLoading.cpp] [Line:3710]

Nothing has changed from a code side aside from installing the VaRest plugin to engine (which we have since disabled). This was working fine. Any idea what could be causing this?

We are on UE 4.25.1. Package build is a Win64 build. (Both Debug and Development packages are causing this).

Any help would be much appreciated.

Logs show the below which doesn’t seem to guide me anywhere:

[2020.06.20-07.37.59:158][  0]LogSlate: Using FreeType 2.10.0
[2020.06.20-07.37.59:158][  0]LogSlate: SlateFontServices - WITH_FREETYPE: 1, WITH_HARFBUZZ: 1
[2020.06.20-07.37.59:169][  0]LogStreaming: Display: Flushing async loaders.
[2020.06.20-07.37.59:172][  0]LogAssetRegistry: FAssetRegistry took 0.0028 seconds to start up
[2020.06.20-07.37.59:173][  0]LogPackageLocalizationCache: Processed 16 localized package path(s) for 1 prioritized culture(s) in 0.000156 seconds
[2020.06.20-07.37.59:176][  0]LogInit: Selected Device Profile: [WindowsNoEditor]
[2020.06.20-07.37.59:177][  0]LogUObjectBase: Error: Class pointer is invalid or CDO is invalid.
[2020.06.20-07.37.59:177][  0]LogUObjectBase: Error: Class object failed IsValidLowLevelFast test.
[2020.06.20-07.37.59:178][  0]LogWindows: Windows GetLastError: The operation completed successfully. (0)
[2020.06.20-07.38.54:767][  0]LogWindows: Could not start crash report client using ../../../Engine/Binaries/Win64/CrashReportClient-Win64-Development.exe
[2020.06.20-07.38.54:767][  0]LogMemory: Platform Memory Stats for WindowsNoEditor
[2020.06.20-07.38.54:767][  0]LogMemory: Process Physical Memory: 276.32 MB used, 278.01 MB peak
[2020.06.20-07.38.54:767][  0]LogMemory: Process Virtual Memory: 500.66 MB used, 502.64 MB peak
[2020.06.20-07.38.54:767][  0]LogMemory: Physical Memory: 15912.59 MB used,  16773.68 MB free, 32686.27 MB total
[2020.06.20-07.38.54:767][  0]LogMemory: Virtual Memory: 5638.93 MB used,  134212088.00 MB free, 134217728.00 MB total
[2020.06.20-07.38.54:767][  0]Message dialog closed, result: Ok, title: The UE4-Glory Game has crashed and will close, text: Assertion failed: Object->IsValidLowLevelFast() [File:D:/Build/++UE4+Licensee/Sync/Engine/Source/Runtime/CoreUObject/Private/Serialization/AsyncLoading.cpp] [Line: 3710]

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