By the following question it should be clear I am pretty new to writing an Add-in so if the answer is simple, thank for answering.

I am trying to write the code so that I can create a plane at a specific point and am using the code from the API help file losted below;

status=ModelDoc2->ICreatePlaneFixed2 ( P1, P2, P3, useGlobal, &retval );

However I keep getting these two errors, what am I missing? ( I am using the c++ add-in wizard as the template)

    error C2027: use of undefined type 'SldWorks::ModelDoc2'