On top of this, you may be getting the 'too many requests in 1 hour' message. This could be because the server's busy or you've made too many requests at the same time, for example.
To sort the 'too many requests in 1 hour' issue, check the status of the server or sign out of your account, wait a few seconds, refresh the page, and log back in. You can also try to clear your cache/cookies and see if that does the trick.