Problem when using Snapshot Pro

It backs up the databases fine, then when it gets to "files", it stops and after a couple of minutes this error comes up:

"The server encountered an internal error or misconfiguration and was unable to complete your request. Your administrator may not have enabled CGI access for this directory."

I did a search here but did not find this. From a Google search I saw that it must have something to do with my .htacess file, but I couldn't find the solution for fixing it. Any ideas?

UPDATE: Just tried it again with the same subdomain and got this error:

"An unknown response returned from Snapshot backup attempt. Aborting. Double check Snapshot settings."