I'm new here,
I've installed Revit 2012 and wrote an add-in program,
the program can be compiled and add-in tab appeared in Revit,
but could anyone tell me how to solve this problem...
thanks a lot...
In the addin file, you must give the exact name of the class (including possible name space(s)), which represents your external command. Such a class must inherit IExternalCommand Interface. I also believe that the name of the class is case sensitive so check your spelling.
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