Robot Roller-Derby Disco Dodgeball

Robot Roller-Derby Disco Dodgeball

Disco Dodgeball Workshop
Break out your space-wrenches and create your own custom stuff for Disco Dodgeball - songs, levels, glasses, announcer packs, explosions, & more. Submit as an in-game item and earn revenue!
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I always get k_EResultFail error when uploading
When I try to upload my bot name file I always get the k_EResultFail error. Here is what I did:
I created a new ready-to-use item, set the type to "bot names", visibility to private, set a name (no special characters or something like that, just letters and whitespaces). I tried both uploading with and without a thumbnail, still getting this error :/ I pasted the content folder (C:\Users\username\Documents\modding\rrddd\germanbotnames\) and typed some random letters (no special characters) into the change notes box.
So has anyone experienced similiar problems or does anyone know how to solve this?