Realms: Error 6003 / 6004 - Upload limit reached

I know this isn't a bug, but I don't know were to place error.

I have tryed to upload a map, it worked the first time then as soon as I start uploading another one, it gets stuck at 83.5% (Or something along 80-89%).
I have pressed 'Cancel' as it was stuck on that percentage for a while and I try to download it again. I get the error 'Upload failed! (Realms ( ErrorCode: 6003 ): Upload limit reached)'. I have tryed to upload another map and I got the same error. I have waited an hour and still recieve the error.

I have tried all pre1-4 and all of them are the same.