I recently tried to load a diffuser family into Revit MEP 2013 and I kept getting this error, "Types in the data file and the family do not match. row=1, col=1". When I close the box I get an "unrecoverable error has occurred" and Revit crashes and closes. I have loaded and used this diffuser family in Revit MEP 2012 with no problems. I am trying to load multiple types from the same family, but I'm only loading about 6 different types. I've never seen this error but I'm sure someone on here has and knows what it is. Thanks