500 Internal Server Error

[Empress_Swanbottom]

I've got a new 500 Internal Server error now! D: I've installed it, but now whenever I try to do anything in the Admin CP, it sends me to a 500 Internal Server error page stating this-
Server error
The website encountered an error while retrieving http://www.gardencreatures.net/admincp/image/upload. It may be down for maintenance or configured incorrectly.
Here are some suggestions:
Reload this webpage later.
HTTP Error 500 (Internal Server Error): An unexpected condition was encountered while the server was attempting to fulfill the request.

Any help?
The only things I can't access are the links in the Admin CP. I can reach everything else, but when I try to do something in the CP, I get the error page...