UE4 4.26 to UE5 Issue migrating our project

[l_l]

Our goal is to move our Project from 4.26 to UE5.

We have AdvancedSteamSessions and Advanced Sessions Plugin. Which we tried the ue5 plugin here

We have tried rebuilding from source with Visual Studio both the UE5 itself and our project.

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Steps to recreate issue

• List item right clicked the ue4 prject file and switch unreal version (ue5)

When it converts to the ue5 project it would crash on startup. but we fixed the crash on startup by deleting the config files. now when our converted ue5 project opens it opens to a blank level.

The issue
However, when we try to load certain BPs, montages, levels, or certain assets. Ue5 crashes and gives us this issue - its a pretty lengthy error list. 365 in total.

Another option i tried to do was creating a blank ue5 project. Then opening our game project in 4.26 and migrating everything over to the ue5 project.

now we get errors doing it this way too. we get a total of 365 errors… coincidence?

conclusion
The issue I suspect is that it’s failing to load 365 of our assets. Both when we try to switch to the ue5 version and by trying to migrate our files over method.

I know this because its the same amount of errors on both sides. So how could it be failing to load these assets? when it opens just fine in ue4?

I know there has to be something we are missing here. Any help would be much appreciated !

[ZenLeviathan]

Hey @l_l, Hope developing is going well other than this issue!
My first thought when I see all of the error messages, specifically those around Advanced Locomtion V4, is that those assets have their own updates for UE5 as well, and you may have to re-import those, and the reason it loads in UE4 is because that is what you have downloaded at the moment. Maybe try with a blank project, importing all the new assets, then try importing the old project.
I hope this can help, and reach out if you have more questions/issues!
-Zen

[l_l]

Hey there thanks for the response.

So im actually using the community version of als since our project is replicated.

But, i did try what you suggested and i still get the same errors.

i feel im close but still cant seem to figure out how to update

[christuusgnosis]

VR expansion plugin is not finalized for ue5 until after the author gets the 5.1 final
you can’t migrate the 4 version of vrep to 5

I suggest this
make a blank project with the vrep teplate in 5
migrate everything except als and the vrep plugins over
then add als to it separately
I start from the vrep template then before opening I drop the precompiled plugins in the start it.
the project you migrate to should already have vrep running

there are some bp node changes between 4.26 and 5