I'm having crashing problems!

[Get_Rekt2003]

I am using Unreal Engine 5, and have had it crash on me several times in a row after trying to change the class in a subsystem node on a blueprint. Here is the error message list:

Assertion failed: this [File:D:\build++UE5\Sync\Engine\Source\Runtime\CoreUObject\Private\UObject\Class.cpp] [Line: 2640]

0x00007ffdce1c05d6 UnrealEditor-CoreUObject.dll!UnknownFunction
0x00007ffdb1adc530 UnrealEditor-BlueprintGraph.dll!UnknownFunction
0x00007ffda0ed9322 UnrealEditor-KismetCompiler.dll!UnknownFunction
0x00007ffda0eed7fa UnrealEditor-KismetCompiler.dll!UnknownFunction
0x00007ffda0ec4941 UnrealEditor-KismetCompiler.dll!UnknownFunction
0x00007ffda0eb97fc UnrealEditor-KismetCompiler.dll!UnknownFunction
0x00007ffdbcaa9c09 UnrealEditor-Kismet.dll!UnknownFunction
0x00007ffdbca238c8 UnrealEditor-Kismet.dll!UnknownFunction
0x00007ffdcb363712 UnrealEditor-UnrealEd.dll!UnknownFunction
0x00007ffdbcba2e02 UnrealEditor-Kismet.dll!UnknownFunction
0x00007ffdbcbc72bb UnrealEditor-Kismet.dll!UnknownFunction
0x00007ffdcd5573a5 UnrealEditor-Slate.dll!UnknownFunction
0x00007ffdcd557521 UnrealEditor-Slate.dll!UnknownFunction
0x00007ffdcd683425 UnrealEditor-Slate.dll!UnknownFunction
0x00007ffdcd654f6a UnrealEditor-Slate.dll!UnknownFunction
0x00007ffdcd6f145c UnrealEditor-Slate.dll!UnknownFunction
0x00007ffdcd70f332 UnrealEditor-Slate.dll!UnknownFunction
0x00007ffdcd49a7eb UnrealEditor-Slate.dll!UnknownFunction
0x00007ffdcd4854a4 UnrealEditor-Slate.dll!UnknownFunction
0x00007ffdcd4df23f UnrealEditor-Slate.dll!UnknownFunction
0x00007ffdcd4cd5c6 UnrealEditor-Slate.dll!UnknownFunction
0x00007ffdcd4c1f9c UnrealEditor-Slate.dll!UnknownFunction
0x00007ffdd54eaaf0 UnrealEditor-ApplicationCore.dll!UnknownFunction
0x00007ffdd54d5786 UnrealEditor-ApplicationCore.dll!UnknownFunction
0x00007ffdd54ed85e UnrealEditor-ApplicationCore.dll!UnknownFunction
0x00007ffdd54d05b7 UnrealEditor-ApplicationCore.dll!UnknownFunction
0x00007ffe6ed1d159 USER32.dll!UnknownFunction
0x00007ffe6ed1b152 USER32.dll!UnknownFunction
0x00007ffdd550bb26 UnrealEditor-ApplicationCore.dll!UnknownFunction
0x00007ff7d1a9632d UnrealEditor.exe!UnknownFunction
0x00007ff7d1ab57ac UnrealEditor.exe!UnknownFunction
0x00007ff7d1ab589a UnrealEditor.exe!UnknownFunction
0x00007ff7d1ab9114 UnrealEditor.exe!UnknownFunction
0x00007ff7d1acbd04 UnrealEditor.exe!UnknownFunction
0x00007ff7d1acf0ba UnrealEditor.exe!UnknownFunction
0x00007ffe6ef4e8d7 KERNEL32.DLL!UnknownFunction

Does anyone have an idea about what I can do to fix this?

[brs-sebascova]

Hello there @Get_Rekt2003!

Yeah, the Assertion failed with UObject\Class.cpp has showed up in other scenarios across the community, usually tied to a blueprint trying to access an invalid reference.

To rule corrupted data, first step would be to perform a clear cache, via deleting folders Derived Data Cache, Intermediate, and Saved. After that, check your blueprint references, fix up your redirectors from Content Browser, and recompile everything.

If the issue persists after that process, please check the solutions implemented in the threads below:

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