Too many requests. Wait a moment and try again.
When too many actions are submitted in a short time, the latest one isn’t carried out. Wait a moment and do it once more.
What it means
Too many actions of the same kind were submitted in a short time, so this one wasn’t carried out. Actions that already completed are unaffected.
What to do
Wait a moment and do it once more. Avoid clicking repeatedly or refreshing the page over and over.
For the similar message at sign-in, see Too many attempts. If it keeps appearing, contact support and tell us the page and the action.