Starting Session in UEFN impossible | Validation Error

Hey guys, I hope you can help me with this type of problem that only occured in just one of my maps. It seems to be a type of validation error.

So for a longer period of time I haven´t started a session in UEFN, but now when I click the starting session button it won´t stop loading, then a message pops up saying “Can´t start a game, Failed to resolve validation session result.”.
So now it´s literally not possible for me to start a session in my creative map.

Also the following error occurs in my Output-Log while trying to start a session:

LogValkyrie: Error: FlowStep_ResolveSessionCandidates(): Failed to resolve validation session with error [{
“host”: “content-service.bfda.live.use1a.on.epicgames.com”,
“method”: “GET”,
“path”: “/api/content/v4/validation/session/366cff72-d446-4a90-87bf-a21fd5133cc8/resolve”,
“errorCode”: “errors.com.epicgames.content-service.module_validation_session_invalid_operation”,
“errorMessage”: “session 366cff72-d446-4a90-87bf-a21fd5133cc8 cannot be resolved until all candidate validations have been trigerred”
}]

1 Like

In the 3 dot menu next to Launch Session, do a Validate Project and see if the message log has any insight,

I have this issue to, when i press the validate project, it says everything is up to date and there’s no problem but when i press launch session i get the Failed to resolve validation session message again

Even when I delete everything, it works normally.

alr guys if anyone has the same problem delete your music that you added if it is way to long then it will work

I don’t have a musician on my island.

Same, if you all happen to figure something out definatly post, I’m having this problem too. I don’t have music in my island either. When trying to Launch session I get stuck at 43% Creating Module and then this error.

Same here

Same issue - I’ve got 5+ levels in my project, only seems to be occuring on my main level with the level design. I can push and launch in to my verse test levels within the same project. This needs addressing! Cannot work on project currently. /help /cry

Same here. I hope there’s a solution to this.

Me too run in this problem…

Same here, it suddenly stopped working

Same issue :frowning: stuck at 43%
Failed to validate candidate module versions

tf is happening i can launch any map of mine because of this

I’m having the same issue, but for me, it works about once every 15 tries. You just have to retry every times, and eventually it goes through. (If you urgently need to test your map, it might be worth trying)