I've manage to get the php site running but encounter an error that I cannot resolve when a user is attempting to log into the website.

ID: test
PW: testuser

after logging in there is a link that say click here.
after clicking on the link IIS display an error

Server Error
500 - Internal server error.
There is a problem with the resource you are looking for, and it cannot be displayed.

Test server: http://zm.dyndns.org/Ragnarok

Does anyone got any idea on how to approach a resolution for this issue? Thanks.