# UE5 can't open any blueprint

**URL:** <https://forums.unrealengine.com/t/ue5-cant-open-any-blueprint/557625>\
**Category:** Programming & Scripting\
**Tags:** unreal-engine\
**Created:** [May 15, 2022, 10:42am UTC](https://forums.unrealengine.com/t/ue5-cant-open-any-blueprint/557625 "2022-05-15T10:42:30Z")\
**Posts on this page:** 12\
**Page:** 1

<div class="post-metadata">

**Author:** ![Benjamin4564](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Benjamin4564](https://forums.unrealengine.com/u/Benjamin4564)\
**Post date:** [May 15, 2022, 10:42am UTC](https://forums.unrealengine.com/t/ue5-cant-open-any-blueprint/557625/1 "2022-05-15T10:42:31Z")

</div>

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

---

<div class="post-metadata">

**Author:** ![Idknoidealol](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Idknoidealol](https://forums.unrealengine.com/u/Idknoidealol)\
**Post date:** [May 15, 2022, 7:23pm UTC](https://forums.unrealengine.com/t/ue5-cant-open-any-blueprint/557625/2 "2022-05-15T19:23:31Z")

</div>

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 ?

---

<div class="post-metadata">

**Author:** ![Benjamin4564](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Benjamin4564](https://forums.unrealengine.com/u/Benjamin4564)\
**Post date:** [May 16, 2022, 8:45am UTC](https://forums.unrealengine.com/t/ue5-cant-open-any-blueprint/557625/3 "2022-05-16T08:45:25Z")

</div>

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:

```auto
Unhandled Exception: EXCEPTION_ACCESS_VIOLATION writing address 0x00007ffc59151398

VCRUNTIME140
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Core
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
UnrealEditor_CoreUObject
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UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_UnrealEd
UnrealEditor_Engine
UnrealEditor_Engine
UnrealEditor_CoreUObject
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UnrealEditor_CoreUObject
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UnrealEditor_Engine
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UnrealEditor_ContentBrowser
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user32
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atlthunk
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UnrealEditor_ApplicationCore
UnrealEditor
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kernel32
ntdll

```

---

<div class="post-metadata">

**Author:** ![Idknoidealol](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Idknoidealol](https://forums.unrealengine.com/u/Idknoidealol)\
**Post date:** [May 19, 2022, 8:40am UTC](https://forums.unrealengine.com/t/ue5-cant-open-any-blueprint/557625/4 "2022-05-19T08:40:17Z")

</div>

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.

---

<div class="post-metadata">

**Author:** ![Benjamin4564](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Benjamin4564](https://forums.unrealengine.com/u/Benjamin4564)\
**Post date:** [May 19, 2022, 9:26am UTC](https://forums.unrealengine.com/t/ue5-cant-open-any-blueprint/557625/5 "2022-05-19T09:26:06Z")

</div>

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

---

<div class="post-metadata">

**Author:** ![Benjamin4564](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Benjamin4564](https://forums.unrealengine.com/u/Benjamin4564)\
**Post date:** [May 19, 2022, 10:14am UTC](https://forums.unrealengine.com/t/ue5-cant-open-any-blueprint/557625/6 "2022-05-19T10:14:27Z")

</div>

I checked the log befor freeze and it says this:

```auto

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

---

<div class="post-metadata">

**Author:** ![Idknoidealol](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Idknoidealol](https://forums.unrealengine.com/u/Idknoidealol)\
**Post date:** [May 19, 2022, 7:13pm UTC](https://forums.unrealengine.com/t/ue5-cant-open-any-blueprint/557625/7 "2022-05-19T19:13:28Z")

</div>

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 ?

---

<div class="post-metadata">

**Author:** ![Benjamin4564](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Benjamin4564](https://forums.unrealengine.com/u/Benjamin4564)\
**Post date:** [May 19, 2022, 8:26pm UTC](https://forums.unrealengine.com/t/ue5-cant-open-any-blueprint/557625/8 "2022-05-19T20:26:50Z")

</div>

Yes both. VS 2022 and UE4 4.27

---

<div class="post-metadata">

**Author:** ![Idknoidealol](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Idknoidealol](https://forums.unrealengine.com/u/Idknoidealol)\
**Post date:** [May 21, 2022, 10:48am UTC](https://forums.unrealengine.com/t/ue5-cant-open-any-blueprint/557625/9 "2022-05-21T10:48:25Z")

</div>

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.

---

<div class="post-metadata">

**Author:** ![Benjamin4564](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Benjamin4564](https://forums.unrealengine.com/u/Benjamin4564)\
**Post date:** [May 21, 2022, 1:56pm UTC](https://forums.unrealengine.com/t/ue5-cant-open-any-blueprint/557625/10 "2022-05-21T13:56:55Z")

</div>

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

---

<div class="post-metadata">

**Author:** ![Polite\_Muon](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Polite\_Muon](https://forums.unrealengine.com/u/Polite_Muon)\
**Post date:** [May 21, 2022, 9:43pm UTC](https://forums.unrealengine.com/t/ue5-cant-open-any-blueprint/557625/11 "2022-05-21T21:43:25Z")

</div>

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.](https://forums.unrealengine.com/t/project-upgraded-from-4-27-to-ue5-instantly-crashing/517658/5)

Another point to look out for is that some nodes may be depreciated which can be found in the [Migration Guide](https://docs.unrealengine.com/5.0/en-US/unreal-engine-5-migration-guide/).

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

---

<div class="post-metadata">

**Author:** ![Benjamin4564](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Benjamin4564](https://forums.unrealengine.com/u/Benjamin4564)\
**Post date:** [May 22, 2022, 9:20am UTC](https://forums.unrealengine.com/t/ue5-cant-open-any-blueprint/557625/12 "2022-05-22T09:20:04Z")

</div>

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