UE4 to 5.0.0 Migration Crashing

Development Platform & Builds
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1

Hello,

We are attempting to migrate our project to 5.0.0 from 4.26.2 and we are having difficulty. We followed the steps in the Unreal Engine 5 Migration guide, each time making a copy for conversion. (Unreal Engine 5 Migration Guide | Unreal Engine Documentation)
After we follow those steps, we receive the crash log included in the picture when we attempt to open the new 5.0 project.
-We have successfully updated the project to 4.27, but we tried migrating from the 4.27 build to 5.0 which does not work, for the same reasons.
-We have tried migrating a small section of our project manually, but as soon as we open any blueprints, the same crash occurs. This even happens if we create a new blueprint class.
-We have updated the plugin we use (easyballistics) which has also failed to resolve the issue.
-We have created a blank 5.0 project with above plugin and it does not crash.
-We have verified/reinstalled UE5 which has failed to resolve the issue.

Clearly something is going wrong with something in our project but we aren’t sure how to pin down what the issue is or which assets might be the troublemakers.

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2

same here, infact I was working on the early access thinking I would be better prepared for the release right this second, its IMPOSSIBLE to click on any blueprint without crashing
deleted the config file rebuild from source, followed the migration process. I cannot even open it on any other version to try right click and migrate my content.

Please do share if you are able to fix it

3

Might be your blueprints are trying to access a plugin and it is not loaded yet. Whatever your plugin is try changing its loading phase to PreDefault. (find the plugin in your ue5 install directory in program files /engine/plugins/easyballistics.uplugin ) uplugin is a text file with the load phase setting in it.

4

I was quite sure it was plugin related, but it turns out our issue was related to nested blueprint structs, if you are having the same issue try the method I outlined in this thread.

With this our problem was solved

https://forums.unrealengine.com/t/project-upgraded-from-4-27-to-ue5-instantly-crashing/517658/2

1 Like
5

MahoganyLogs’s link solved my problem.

6

Im still trying your approach and it seems like this would be one of the issues however one of my structs, I couldnt even right click it it just crashes the engine

nsure condition failed: !UberGraphFramePointerProperty == !UberGraphFunction [File:D:\build\++UE5\Sync\Engine\Source\Runtime\Engine\Private\BlueprintGeneratedClass.cpp] [Line: 1357]
[2022.04.10-12.27.33:805][775]LogOutputDevice: Error: 
[2022.04.10-12.27.33:806][775]LogOutputDevice: Error: Stack: 
[2022.04.10-12.27.33:806][775]LogOutputDevice: Error: [Callstack] 0x00007ff9477b6edf UnrealEditor-Engine.dll!UnknownFunction []
[2022.04.10-12.27.33:806][775]LogOutputDevice: Error: [Callstack] 0x00007ff95e8cfa2c UnrealEditor-CoreUObject.dll!UnknownFunction []
[2022.04.10-12.27.33:806][775]LogOutputDevice: Error: [Callstack] 0x00007ff94739cfcf UnrealEditor-Engine.dll!UnknownFunction []
[2022.04.10-12.27.33:806][775]LogOutputDevice: Error: [Callstack] 0x00007ff95e8cf46d UnrealEditor-CoreUObject.dll!UnknownFunction []

I will keep you updated, might be someone out there who has the same issue as I am having

7

you need to do the first two steps in ue4 before migrating to 5

1 Like
8

Unfortunately, these steps couldn’t solve the problem for me. I managed to open the project in UE5, but I can’t open any blueprint or any level containing any blueprint defined in UE4, even the very simple ones. Very annoying. I hope Epic will find a solution to this. Btw, where can I make a bug report?

9

In UE4 check your output log, show warnings only, do you have any unknown structure errors ? if you do open the blueprint its mentioning and compile, save it.