Error 500 when trying to upload a world

Ever since a world of mine "outdated" and I had to download it, whenever I try to upload a world to my Minecraft Realms, it gets to "verifying world" it instantly fails and says "Upload failed! (500)". All world saves and slots do this and it even does it across different Internets. I also tried shutting down the realm and retrying, and failed. I also logged out of my account and back in and still failed. I posted this to the Minecraft Realms forum but no one responded or even acknowledged it.