Server Error 500, Dephi 3.0 C/S and IIS 2.0 running isapi.dll's

When I try to run my isapi.dll I get
this error when the isapi.dll is developed in
Delphi 3.0 C/S

Internal Server Error 500

Exception: EDBEngineError
Message: Interface mismatch. Engine version different.

When I try to execute a Delphi 2.0 C/S
isapi.dll I works perfect.

Can anybody please help me with this.
It's really fustrating !!!!

Please send me a E-mail :)

------- Dag ?verby ==> -------

------- Dag ?verby ==> -------