Confused! HOW to convert RADIOS model to NASTRAN?

Hi

I have a RADIOSS model where I have the mesh, material, properties, contacts and boundary conditions defined for a simple crash test! 

Now I would like to export/convert the model to perform an analysis in NASTRAN.

I have tried to change the User Profile and export the bdf file! But when I try to run it it says that no PARAM was detected

I guess it´s because in NASTRAN you have to select an analysis type and other stuff. But in RADIOSS we kind of don´t do that? 

Thank you!