HTTP 500 internal server error while starting abap web dynpro application

Hi there,

i have some problems concerning my web dynpro abap configurations in the system. When i start an application the browser appears and displays the http 500 internal server error.  The required icf nodes are activated, as far as i know. the following properties are set:

hostname: aet

port: 8000

The generated url for the web dynpro application looks as follows:

http://aet.ls3001:8000/sap/bc/webdynpro/sap/zwdr_test?sap-language=EN

Maybe anybody of you out there has an idea for that situation.

Thanks for your afford and kind regards,

Albert