Nonlinear solver did not converge

Hi everyone!

I am trying to analyse Von misses stresses on my 2D spool valve model under the physics of Fluid-Structure Interaction (FSI). I am a new learner that is why i am using FSI example of COMSOL. during study my model, i am getting several errors with some warnings which are following;

Nonlinear solver did not converge. Maximum number of segregated iterations reached. Time : 0 Last time step is not converged.

Please help me to figure out.

Thanks

Mehdi