500 Internal Server Error

[Dinocanid]

So I followed the installation step-by-step (I have mysidiahost, not x10 or anything else) and when I try to install the script I get this message:

The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator at webmaster@adopttest.mysidiahost.com to inform them of the time this error occurred, and the actions you performed just before this error.

More information about this error may be available in the server error log.

Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.

I could reach the install screen before, but I had the files arranged incorrectly then so I had to start over to put everything in the right place. Now I just get the above message. My website is adopttest.mysidiahost.com