Getting a persistent errors.com.epicgames.content-service.cook_failure linked to asset validation. No asset appears problematic, and UEFN’s validation tool shows no useful feedback. Issue seems unrelated to my project.
Please select what you are reporting on:
Unreal Editor for Fortnite
What Type of Bug are you experiencing?
Other
Steps to Reproduce
Make any update on the island (even a small one)
Click “Start Session” or “Publish”
Watch the cook process fail with assetvalidation error
Check validation → no warnings or broken assets reporte
Expected Result
The island should publish or launch normally, or at least give a precise indication of which asset or issue causes the failure.
Observed Result
Cook fails with the error:
errors.com.epicgames.content-service.cook_failure
cookplugin.assetvalidation
No asset is flagged in validation. Removing recent changes doesn’t fix it.
Everything was working fine — I was able to push and launch sessions multiple times.
No assets were added or modified in the last 24h.
The issue appeared right after adding new Verse code, which points to a possible Verse-related validation bug.
UEFN still lists asset validation failures, but none of the assets were touched recently.
I found someone with the exact same issue on X:
Looks like a server-side issue that was fixed for others. Please apply the same fix.
“It looks like the same error, but I don’t think it’s the same problem. SlateMars has 2210 map check issues.”
→ Honestly, I have no idea. I saw the 2210 map check issues, but I don’t think it’s the same problem.
“What assets did you use with the Verse you added?”
→ Mainly trigger, a plank, mutator zone, timer, and teleporter. Nothing too complex.
