500 internal server error

[dealertje]

Hi , i run phpnuke 6.5
I have uploaded alle the files for cpgnuke1.2.0rc4

but when i want to install it i get this message

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, polytunes@polytunes.be and inform them of the time the error occurred, and anything you might have done that may have caused the error.

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


What can i do about it?

[DJMaze]

Please contact the server administrator, polytunes@polytunes.be and inform them of the time the error occurred