Sometimes users may see a banner in the top of their workspace with the words "Ajax Error 500" followed by more detailed information. This is a generic error code that can be caused by a range of factors. Sometimes the errors are temporary, so it is worth waiting a few minutes and trying the action again.
If the error persists, the best course of action is to take a screenshot of the error message and send a message to us at [email protected] along with a short description of what action lead to getting the error.