Needs solution for the problem

Hi people i have a doubt,

Imported .stp file generated from solidworks model and attempting to run static load analysis

on assembly saved as part file. Entered name and in study window for static analysis, and error

message received on entering: 'thickness not defined for one or more shells'. Same message

returns when attempting to mesh, and analysis cannot be run.

I attched  my model in below link

https://drive.google.com/file/d/0B_La8arsN9olS2Nwd3EyU2tPeE0/edit?usp=sharing

SolidworksSimulation