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When I run the calculation I get a message that says " No convergence of nonlinare problems. Do you want to continue?" When I press "Yes" it starts calculating again, but the same message appears few minuttes later.
Does anybody know how to solve it or what it means?
This means that Robot is not able to find the solution for the non-linear analysis you defined. There may be a lot of reasons for this starting from ignored instability, excessive load value etc.
See e.g. http://forums.autodesk.com/t5/Autodesk-Robot-Structural/Relaxation-with-robot/td-p/3416615
Please try to use the parameters as shown on the attached picture.