When trying to run the project, "Unhandled Exception: EXCEPTION_ACCESS_VIOLATION"

[Inngvarr]

When I try to open projects in the editor, it crashes.
"LogWindows: Error: Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x0000000000000058
[2025.10.23-15.01.03:019][ 0]LogWindows: Error:
[2025.10.23-15.01.03:019][ 0]LogWindows: Error: [Callstack] 0x00007fff512c806f UnrealEditor-Engine.dll!UnknownFunction
[2025.10.23-15.01.03:019][ 0]LogWindows: Error: [Callstack] 0x00007fff3adc09e2 UnrealEditor-MeshBuilder.dll!UnknownFunction
[2025.10.23-15.01.03:019][ 0]LogWindows: Error: [Callstack] 0x00007fff3adbc109 UnrealEditor-MeshBuilder.dll!UnknownFunction
[2025.10.23-15.01.03:019][ 0]LogWindows: Error: [Callstack] 0x00007fff3adad254 UnrealEditor-MeshBuilder.dll!UnknownFunction
[2025.10.23-15.01.03:019][ 0]LogWindows: Error: [Callstack] 0x00007fff3ada25ea UnrealEditor-MeshBuilder.dll!UnknownFunction
[2025.10.23-15.01.03:019][ 0]LogWindows: Error: [Callstack] 0x00007fff5231f27c UnrealEditor-Engine.dll!UnknownFunction
[2025.10.23-15.01.03:019][ 0]LogWindows: Error: [Callstack] 0x00007fff52321909 UnrealEditor-Engine.dll!UnknownFunction
[2025.10.23-15.01.03:019][ 0]LogWindows: Error: [Callstack] 0x00007fff52322386 UnrealEditor-Engine.dll!UnknownFunction
[2025.10.23-15.01.03:019][ 0]LogWindows: Error: [Callstack] 0x00007fff5232fdec UnrealEditor-Engine.dll!UnknownFunction
[2025.10.23-15.01.03:019][ 0]LogWindows: Error: [Callstack] 0x00007fff523fd993 UnrealEditor-Engine.dll!UnknownFunction
[2025.10.23-15.01.03:019][ 0]LogWindows: Error: [Callstack] 0x00007fff50695392 UnrealEditor-Engine.dll!UnknownFunction
[2025.10.23-15.01.03:019][ 0]LogWindows: Error: [Callstack] 0x00007fff50694bbe UnrealEditor-Engine.dll!UnknownFunction
[2025.10.23-15.01.03:019][ 0]LogWindows: Error: [Callstack] 0x00007fff55480f28 UnrealEditor-Core.dll!UnknownFunction
[2025.10.23-15.01.03:019][ 0]LogWindows: Error: [Callstack] 0x00007fff5099cce9 UnrealEditor-Engine.dll!UnknownFunction
[2025.10.23-15.01.03:019][ 0]LogWindows: Error: [Callstack] 0x00007ff71551d773 UnrealEditor.exe!UnknownFunction
[2025.10.23-15.01.03:019][ 0]LogWindows: Error: [Callstack] 0x00007ff7155245a3 UnrealEditor.exe!UnknownFunction
[2025.10.23-15.01.03:019][ 0]LogWindows: Error: [Callstack] 0x00007fff5500dc55 UnrealEditor-Core.dll!UnknownFunction
[2025.10.23-15.01.03:019][ 0]LogWindows: Error: [Callstack] 0x00007fff5500d9b6 UnrealEditor-Core.dll!UnknownFunction
[2025.10.23-15.01.03:019][ 0]LogWindows: Error: [Callstack] 0x00007fff55033db1 UnrealEditor-Core.dll!UnknownFunction
[2025.10.23-15.01.03:019][ 0]LogWindows: Error: [Callstack] 0x00007fff54ff5fe5 UnrealEditor-Core.dll!UnknownFunction
[2025.10.23-15.01.03:020][ 0]LogWindows: Error: [Callstack] 0x00007fff55211a33 UnrealEditor-Core.dll!UnknownFunction
[2025.10.23-15.01.03:020][ 0]LogWindows: Error: [Callstack] 0x00007fff556b37cd UnrealEditor-Core.dll!UnknownFunction
[2025.10.23-15.01.03:020][ 0]LogWindows: Error: [Callstack] 0x00007fff556ac91f UnrealEditor-Core.dll!UnknownFunction
[2025.10.23-15.01.03:020][ 0]LogWindows: Error: [Callstack] 0x00007fffea107374 KERNEL32.DLL!UnknownFunction
[2025.10.23-15.01.03:020][ 0]LogWindows: Error:
[2025.10.23-15.01.03:020][ 0]LogWindows: Error: Crash in runnable thread Foreground Worker #1
[2025.10.23-15.01.03:033][ 0]LogExit: Executing StaticShutdownAfterError
[2025.10.23-15.01.03:057][ 0]LogWindows: FPlatformMisc::RequestExit(1, FRunnableThreadWin::GuardedRun.ExceptionHandler)
[2025.10.23-15.01.03:057][ 0]LogWindows: FPlatformMisc::RequestExitWithStatus(1, 3, FRunnableThreadWin::GuardedRun.ExceptionHandler)
[2025.10.23-15.01.03:057][ 0]LogCore: Engine exit requested (reason: Win RequestExit)
"

[BRGEzedeRocco]

Hello @Inngvarr
It seems the error is related to a mesh. If you recently imported one, that’s likely the cause.
Try deleting it from your project to see if the editor opens without crashing.

I also found a similar post where the issue was caused by corrupted or misconfigured LODs.

500×500 2.84 KB

SOLUTION: On a long shot I started opening every single skeletal mesh from the content browser and I found two that crashed… the ONLY thing special about these two is they were background LOD versions of skeletal meshes that had their LOD0 capped at 25% deleting these meshes manually in windows explorer and recreating them in the content browser fixed the levels not opening issue. This worked for me after much trial and error troubleshooting.

If that doesn’t fix it, try the following:

• In the Epic Games Launcher, select Verify on the Unreal Engine version you’re using. This will repair any corrupted engine files.
  
  
• Delete the Saved and Intermediate folders from your project. When you restart the editor, Unreal will rebuild all temporary files and shader caches from scratch.
  
  

Hope it helps!