Dear Madhan M.D apparently you've passed the licence limitations. If you're using a student version of CST STUDIO you can only able to model not very complex structures.
First four are just warnings, it should not stop your simulation anyway. And give you post-processed data whatever CST could offer. Last one is related to meshing. Just keep minimum mesh count and check your simulation.
It would be helpful if the picture of the geometry was also shared to give an idea. Usually complex PCBs and Housing step files generated by mechanical teams have very high CAD faces. If it's a PCB then working around the problem would be tricky. If it's a housing structure, a simple drawing of the same would be sufficient to do away with such an error.
And like Payman correctly pointed out it has to do with the type of license you are using.