Summary When I try to launch session after the latest update (36.20) on this project it keeps giving an error “Failed to validate module candidate versions”. I tried to delete some of the assets that show up in the output log error but that didn’t change the error. I can’t launch session at all. Pl…

UPDATE: Removing all the assets showing in the error log and their references let us launch session, but we still don’t know why those assets were a problem and removing them isnt really a long term solution.

I have the same problems! Great last update :frowning:

hi @Gurkis , @MagicThor You will need to run [Validation Fixer as described in] ( Validation and Fix-Up Tool in Unreal Editor for Fortnite | Fortnite Documentation | Epic Developer Community }

Hi @Jimbohalo10 , big thanks! But I have a problem with Referenced Content via Fab integration; there is no way I can fix, in my case… [image] [SOLVED]! UEFN Validation Error: Fab Referenced Content (CGMA Studio Offices) Fails Module Validation Despite Being Purchased and UE…

This is the errors i’m receiving when trying to launch a test session [image] [uefnerror2] [uefnerror3] [uefnerror4]

@Gurkis is this still happening? Could we get your logs?

Yes, I Zipped the whole folder. Logs.zip (14.3 MB)

I’d also like to add that I have tried a lot to get around this. There are no errors listed in message log, only output log. Editor Loads Project in Slow. Cannot Launch a Session. Ended up Reverting Back to Older Snapshot so I could make an update, but cannot build new hlods so progress is really a…

I’ve been having this issue this week too. In my session its related to a material instance of the Custom Creative landscape and adding it to custom meshes. It also might be related to their use with data layers. This is a consistent repeating bug. I rolled back to leave this bug behind but it came…

Turn on view HLODs in the Outliner via the Editor Preferences type HLOD in the outliner filter. There are a couple of rogue props generating HLOD layers, but because they are not referenced by your project it makes them invalid. Any HLOD references there that are not your HLOD layer name are eith…

[BLOCKER] Can't launch session, module validation failed

General Issues and Bug Reporting

MagicThor (Magic Thor) July 17, 2025, 10:07am 5

Hi @Jimbohalo10 , big thanks!
But I have a problem with Referenced Content via Fab integration; there is no way I can fix, in my case…