Unfortunately there was an error while solving the problem. This might happen from time to time. Maybe a cache got deleted that should not have. Try going back to the first step and go through the project again.
error: PETSc error 73-0 'Matrix is missing diagonal entry in row 18813' in /home/admin/libs/petsc-3.7.5/src/mat/impls/aij/seq/aij.c MatZeroRowsColumns_SeqAIJ:1909
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