[CRITICAL] Launching Session Error – “At least 1 module failed remote validation"

aynjml
Wed, 25 Feb 2026 14:02:12 +0000
Issues and Bug Reporting

Summary

This issue randomly started happening happening on ALL of my projects where I am unable to launch a session. Whenever I try, it fails with the error: “At least 1 module failed remote validation.”

It has this error line in the output log:
LogValkyrie: Error: FlowStep_ResolveSessionCandidates(): Candidate module [5dcc6ed6-4cef-bae1-82af-1d9b792f2230] failed validation with error: [errors.com.epicgames.pre-processing.download_failure]

I haven’t been able to identify what is causing this. It’s also not limited to just me, I don’t think this is actually a problem on my end. Multiple people in the community are experiencing the same problem.

Previously everything was working perfectly fine but it just randomly stopped working.

I also wanted to mention that fortnite still loads but I have to push changes and my game is in the specific area you are in when you join creative 1.0 (But without the portals).
Also when I push changes I get the same error.

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Other

Steps to Reproduce

Everytime I launch session or push changes

Expected Result

My project would have it’s session launched normally

Observed Result

Error Message: “At least 1 module failed remote validation”
Output Log Error: LogValkyrie: Error: FlowStep_ResolveSessionCandidates(): Candidate module [5dcc6ed6-4cef-bae1-82af-1d9b792f2230] failed validation with error: [errors.com.epicgames.pre-processing.download_failure]

Platform(s)

PC
(Minimum requirements met for UEFN)

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Additional Notes

I saw one other thread where sombody else had the same problem and 2 staff members cleared the account cache and I think it fixed the issue so I would really appreciate if a staff member helps me on this

12 posts - 4 participants