Error in tfm model

what does this error mean?
ERROR uild/pymfix/iterate.f90:744
500

Looks like you reached the maximum number of iterations when adjusting the pressure drop in a periodic BC. Try to increase MAXOUTIT, line 717 of iterate.f (need to rebuild the solver)

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Thank you man!! Also would you please tell me if I want to run steady by putting the time step blank, how can I write the outputs? vtu I mean… since it needs timestep while we run steady case…
And mostly when I decide to run steady, I face singularities in most of the matrixes and it will interrupt the program while there is no problem in running unsteady . what is the problem?