[CRITICAL] Unable to launch session – “At least 1 module failed remote validation”


:file_folder: Intermediate

  • Stores temporary files used by UEFN during build and run.

  • Safe to delete – UEFN will recreate it automatically.

  • Delete it if you have build errors or slow performance.


:file_folder: Saved

  • Stores temporary settings and log files for your project.

  • Safe to delete – but you might lose some minor settings.

  • Delete it if UEFN is not working properly or shows errors.

    C:\Users\AppData\Local\UnrealEditorFortnite

Before deleting the files, close the UEFN engine, then delete the two folders.
Don’t worry, it’s a safe and proven method.
After that, try again and let me know if the problem is solved.