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

the same for me

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Same issue are is there any advice on how to fix this?
in my case I’m using entity and scene graph maybe this is causing this? I’ve never had this issue before and this is the forst time using scene graph and entities

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I do not use scene graph, i think its just a bug from the latest update?

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It’s on Epic’s back end this has been going on for around 3-4 months they fix it and it crashes again. Don’t mess with your projects it’s not on you also wait a couple hours it should pass.

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私も同じです。シーングラフもエンティティも使用していません。

My project that I just made and has only a few cubes, 2 spawners and a landscape is having this issue

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Appears to have been fixed on the backend

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yep, its working for me also now.

Work for me to, now

I think it’s fixed now!

Same error here since today – exact same message:

LogValkyrie: Error: FlowStep_ResolveSessionCandidates(): Candidate module […] failed validation with error: [http_error_500:valkyrie-cook-api.prod.ucs.on.epicgames.com]

Tried:

  • New map
  • Validation fixes
  • Restarting UEFN and PC
  • Duplicating the project
    → Still broken

Please confirm if this is a backend issue. Would be great if someone from Epic could acknowledge this, seems a lot of people are running into it.

Yea its nothing were doing or it would work on the normal epic templates so its deffo epic backend. Seems to be fixed now tho ?

hi @AtAshTag and all, and @Bug-Reporter need more info
Possible workaround post

Failed to validate candidate module versions [SOLVED] - Development / Programming & Scripting - Epic Developer Community Forums

needs a real fix
hi @Flak , the above link is not showing in bug list

This seems to have been resolved albeit the bug report/any acknowledgement from epic was minimal visually.