Re: Error in simulation
The same happened to me today. You need both lib and olb files. Olb has the objects you can include in your circuit, and lib has the definitions of them.
Try this guide: http://www.irf.com/product-info/models/sim/pspice_instruction.pdf
"Add as global" did not work for me, but "Add to design" did. So I will need to add the ...