Magademoisapi.dll error 500 on IIS

Hi,
I’m trying to install Megademoisapi.dll on IIS 8 but I receive “HTTP Error 500.0 - Internal Server Error”. I’ve tried other isapi dll (such as the datasnap embarcadero demo) and it works. So I don’t understand where is the error.

can you debug this ISAPI with IIS Express and see what is wrong?

this article can be helpful.

Thank’s for your help, with IIS Express the dll works, damn I cannot understand what is wrong in IIS setup