Workflow/Monitoring

I have been working on installing the Workflow/Monitoring for a few days but it do not work.

i have installed the IDM and it works properly. Also the Smarty Template Engine and php are working without exepctions. But when i open the workflow/monitoring template there is allways an Error 500 in the internet explorer(by the way it is a windows based system)

Have you got any hints for me?

Thanks for your help.