Upload gets Error: "We couldn't pack your world file for upload. Maybe your hard drive is full."

i was trying to replace my realm world but it came up with the message "we couldn't pack your world file for upload. maybe your hard drive is full." but i have loads of storage as i only have 3 realms and one world. and idea on how t fix it because i dont want to waist my monet on a realm that i wont play on.