Anyone know how to use mastercam for solidworks fbm?

Im currently using solid works 2010 integrated with Mastercam x7 for solidworks sofware. When I use the FBM option in mastercam and a solidworks dialog box comes up to select the body, I select the body or solid, click o.k., then go back to the parameter page in mastercam and it doesn't recognize the selection. any suggestions?

SolidworksUser Interface