Dear all, I am using the Mapping function (VCSMapping) and it gave me some errors which I do not really understand the meaning. The simulation was executed in parallel: mpirun -np 8 IncNavierStokesSolver session.xml mesh.msh.xml Output message: ... CFL (zero plane): 1.15785e+20 (in elmt 520) CG iterations made = 5001 using tolerance of 1e-09 (error = nan, rhs_mag = inf) ------------------------------------------------------- Primary job terminated normally, but 1 process returned a non-zero exit code.. Per user-direction, the job has been aborted. ------------------------------------------------------- -------------------------------------------------------------------------- mpirun detected that one or more processes exited with non-zero status, thus causing the job to be terminated. The first process to do so was: Process name: [[36638,1],4] Exit code: 1 -------------------------------------------------------------------------- and the error messages are: Fatal : Level 0 assertion violation Exceeded maximum number of iterations I also have obtained a batch of error messages, however I think they are result of the simulation errors. Nevertheless, if you want them or any other file, please let me know. So please, could you explain to me why I have obtained these error? Thank you very much for your help. Regards, Guillermo