UE5 can't open any blueprint

Benjamin4564 · May 15, 2022, 10:42am

I switched from UE4 to UE5 by migrating everything in a blank project (All other ways failed). But if I try to open any blueprint it doesn’t do anything. The engine frezzes and nothing happens. But the task manager says the engine uses 20% CPU but has no active shader compiler. After waiting 1 hour I then closed the engine with the task manager

I hope someone knows an answer

Idknoidealol · May 15, 2022, 7:23pm

Hey,
I guess more details are needed.
Does this happen only with blueprints are with any type of uasset (for example, a level or a texture) ?
And is your issue just on this project or do you have the same problem with other projects ?

Benjamin4564 · May 16, 2022, 8:45am

So I tried some things aout and I think I know where the error comes from, but I don’t know how to solve it. If I open a blueprint, that is not related to my main character, it open. But if I open the main character the engine freezes. While doing it there are in addition no shader compiler in the background. So I tried to open the anim blueprint and it freezes as well. If I go throug all my montages in the folder something strange happens. Some of them, also implemented in the main character will open as normal and only freeze, if I open the anim bp in it. But there are 4-5 montages, that bring a freeze with them, if I try to open them, that are all in the anim bp

Sometimes it even crashes with this error:

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION writing address 0x00007ffc59151398

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Idknoidealol · May 19, 2022, 8:40am

That’s kinda strange. Does it still opens normally in UE4 ? Also, access violations are more likely to show when using Visual Studio, so I wonder if you have it installed on your computer …
I think that the migration went wrong and accidently modified an important file like the character class file (c++). So UE5 might be searching for informations in this file and could not find them.

Benjamin4564 · May 19, 2022, 9:26am

It opens completely normal in UE4. If I for example try to open my UE4 project in UE5 by creating a copy the engine always crashes while starting so migrating is the only way I found. In addition it says migration succesful and nothing about files, that can’t be copied. VS 2022 is also installed on my machine with the c++/unreal game deveolpment package

Benjamin4564 · May 19, 2022, 10:14am

I checked the log befor freeze and it says this:


Script Stack (0 frames):

[2022.05.19-10.08.19:335][447]LogStats: FPlatformStackWalk::StackWalkAndDump -  0.224 s
[2022.05.19-10.08.19:335][447]LogOutputDevice: Error: === Handled ensure: ===
[2022.05.19-10.08.19:335][447]LogOutputDevice: Error: 
[2022.05.19-10.08.19:335][447]LogOutputDevice: Error: Ensure condition failed: !UberGraphFramePointerProperty == !UberGraphFunction [File:D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\BlueprintGeneratedClass.cpp] [Line: 1357]
[2022.05.19-10.08.19:335][447]LogOutputDevice: Error: 
[2022.05.19-10.08.19:335][447]LogOutputDevice: Error: Stack: 
[2022.05.19-10.08.19:335][447]LogOutputDevice: Error: [Callstack] 0x00007ffd06166edf UnrealEditor-Engine.dll!UnknownFunction []
[2022.05.19-10.08.19:335][447]LogOutputDevice: Error: [Callstack] 0x00007ffd0a0bfa2c UnrealEditor-CoreUObject.dll!UnknownFunction []
[2022.05.19-10.08.19:335][447]LogOutputDevice: Error: [Callstack] 0x00007ffd05d4cfcf UnrealEditor-Engine.dll!UnknownFunction []
[2022.05.19-10.08.19:335][447]LogOutputDevice: Error: [Callstack] 0x00007ffd0a0bf46d UnrealEditor-CoreUObject.dll!UnknownFunction []
[2022.05.19-10.08.19:335][447]LogOutputDevice: Error: [Callstack] 0x00007ffd0a08d70a UnrealEditor-CoreUObject.dll!UnknownFunction []
[2022.05.19-10.08.19:335][447]LogOutputDevice: Error: [Callstack] 0x00007ffd09e0c507 UnrealEditor-CoreUObject.dll!UnknownFunction []
[2022.05.19-10.08.19:335][447]LogOutputDevice: Error: [Callstack] 0x00007ffd09c60ebe UnrealEditor-CoreUObject.dll!UnknownFunction []
[2022.05.19-10.08.19:335][447]LogOutputDevice: Error: [Callstack] 0x00007ffd09eb0607 UnrealEditor-CoreUObject.dll!UnknownFunction []
[2022.05.19-10.08.19:335][447]LogOutputDevice: Error: [Callstack] 0x00007ffd09eb0f0b UnrealEditor-CoreUObject.dll!UnknownFunction []
[2022.05.19-10.08.19:335][447]LogOutputDevice: Error: [Callstack] 0x00007ffd09ef3d5d UnrealEditor-CoreUObject.dll!UnknownFunction []
[2022.05.19-10.08.19:335][447]LogOutputDevice: Error: [Callstack] 0x00007ffd0a0b91d7 UnrealEditor-CoreUObject.dll!UnknownFunction []
[2022.05.19-10.08.19:335][447]LogOutputDevice: Error: [Callstack] 0x00007ffd09e9bb84 UnrealEditor-CoreUObject.dll!UnknownFunction []
[2022.05.19-10.08.19:335][447]LogOutputDevice: Error: [Callstack] 0x00007ffd09f546a0 UnrealEditor-CoreUObject.dll!UnknownFunction []
[2022.05.19-10.08.19:335][447]LogOutputDevice: Error: [Callstack] 0x00007ffd09f52cd7 UnrealEditor-CoreUObject.dll!UnknownFunction []
[2022.05.19-10.08.19:335][447]LogOutputDevice: Error: [Callstack] 0x00007ffd09f5474f UnrealEditor-CoreUObject.dll!UnknownFunction []

But I don’t know how to handle this

Idknoidealol · May 19, 2022, 7:13pm

Oh, that’s useful. As I thought, the character class file (in cpp is corrupted. Let me some time to think about how to fix it. Do you still have UE4 installed on your computer ? And do you have Visual Studio ?

Benjamin4564 · May 19, 2022, 8:26pm

Yes both. VS 2022 and UE4 4.27

Idknoidealol · May 21, 2022, 10:48am

Try that : open the following file in Visual Studio.
C or D:\UE_5.0\Engine\Source\Runtime\Engine\Classes\GameFramework\Character.h
Then try to debug it and see if you have any errors.

Benjamin4564 · May 21, 2022, 1:56pm

There are 239 different errors. I try to verify the engine

Polite_Muon · May 21, 2022, 9:43pm

Thank you for posting your question.

I managed to find another post that had a similar experience when attempting to go from UE4 to UE5.

Another point to look out for is that some nodes may be depreciated which can be found in the Migration Guide.

I hope this helps you in finding what may have caused the error.

Benjamin4564 · May 22, 2022, 9:20am

Thanks for your reply. I went through my old 4.27 project, but I can‘t find any nodes that are deprecated