I wanted to add a calendar and each time I receive a message when I want to go to customize under appearances:
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
Any suggestion of a calendar that works? Thanks