Problems Accessing My Application

Problems Accessing My Application

When I click to toggle from edit mode to access my application, I get an error message that says "500: Internal Server Error", and then by browser reverts back to my home page view in Creator.

I am running Mozilla Firefox 1.5.0.7 on a Windows machine. This has not happened before - is this an error on my end? If so, what can I do so that it goes away?