Dynamic Analysis of SAE Baja Roll Cage

Hello all

I was trying to do dynamic analysis for frontal crash with a rigid wall of mine roll cage, but i could not find the way out to the errors given by the Radioss Solver. I searched for previous posts, but still could not understand and getting the same errors. The error reads 'Error in Interface Definition'. I reviewed the master & slave entities, all was correct. But then I saw another error tem namely' Lagrangian Surface is empty'. What does that mean?