IRB660

i m facing problem in using IRB660 when i m inserting this robot in robot studio one msg popup i.e.“the library of type IRB640 for the mechanical unit 'ROB_1’in the robot system’IRB660_180kg-3.15m_3’is not defined.you must manually search for the library.” so please replay if any one knows.

Which version of RobotStudio are you using? Please describe the exact sequence of steps you take.