Halim
I really would love to help. But answering this question is not going to help you.
This forum is not a technical support for the use of software. Computers and Structures has a great website and tutorials.
Please learn how to model. Please learn a little bit of structural analysis before using the software.
If software gives you a warning, something is wrong in your model. I can only help you on some very critical warnings that may show up even when the model seems right.
Having said so, I will be happy to help you on other honest questions.
respects
ijr