Pandey,
> > [...] > -------------------------------------------------------- > An error occurred in line <88> of file > </scratch/software/dealii/dealii-9.0.1/source/lac/petsc_solver.cc> in > function > void dealii::PETScWrappers::SolverBase::solve(const > dealii::PETScWrappers::MatrixBase&, dealii::PETScWrappers::VectorBase&, > const dealii::PETScWrappers::VectorBase&, const > dealii::PETScWrappers::PreconditionerBase&) > The violated condition was: > B != nullptr > Additional information: > *PETSc preconditioner should have anassociated matrix set to be used > in solver.* > -------------------------------------------------------- > This error message is really unexpected if you are running a non-modified version of step-40. Did you change anything? It seems that you are running in Release mode. Do you see the same error message in Debug mode as well or would the code stop to run earlier? Best, Daniel -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/dealii/CAOYDWb%2Bw13VuxNk%3DPPsUuyO0KzeP3RAU2HsU-Rgbo0qoE%2BeSiA%40mail.gmail.com.
