Summary
UEFN memory calculation consistently fails with ContentServiceFailure / module_not_found when retrieving MemoryManifest.json. The project uploads and private versions are created successfully, but publication is blocked because memory calculation data is unavailable.
What Type of Bug are you experiencing?
Online
Steps to Reproduce
- Open an existing UEFN island project.
- Launch a Fortnite editing session.
- Save the project and push changes if necessary.
- Create a new private version or launch the memory calculation.
- Open Project > Launch Memory Calculation and start the calculation.
- Check the memory calculation window and Output Log.
- The calculation fails with a ContentServiceFailure / module_not_found error.
Expected Result
The memory calculation should complete successfully, generate the memory usage report, and allow the island update to proceed through the Creator Portal publication process.
Observed Result
The memory calculation fails and shows an error in UEFN. The Creator Portal blocks publication. The Output Log reports ContentServiceFailure, errors.com.epicgames.content-service.module_not_found, and Could not find the requested resource while requesting MemoryManifest.json. The issue occurred on module versions 507 and 509.
Affects Versions
5.8
Platform(s)
Windows
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Additional Notes
Affected version: Fortnite / UEFN v43.00
Date: November 1, 2026
Project: map1v1BuildFight0delay (Tournoi 1v1)
The project uploads successfully, and new private versions can be created. However, the memory calculation fails consistently.
The same issue occurred with module versions 507 and 509.
Exact error:
Valkyrie::MemoryCalculation::Errors::ContentServiceFailure
errors.com.epicgames.content-service.module_not_found
Could not find the requested resource
MemoryManifest.json
Local validation reports no invalid assets. Five static mesh vertex-count warnings are present, but they do not appear to directly explain the memory calculation failure.
This issue prevents me from publishing my island update.
Please investigate the content service failure and provide a workaround or fix.