# ERROR: The requested URL could not be retrieved

## Sorry ... The requested URL could not be retrieved

> While trying to retrieve the URL: %U

> The following error was encountered:

> - Invalid URL

> Some aspect of the requested URL is incorrect. Possible problems:

> - Missing or incorrect access protocol (should be `http://'' or similar)
> - Missing hostname
> - Illegal double-escape in the URL-Path
> - Illegal character in hostname; underscores are not allowed

> Your cache administrator is %w.