hi there while i was runing step 29 in which uses UMFPACK direct solver i got confused with a vague error as below :
---------------------------------------------------- Exception on processing: -------------------------------------------------------- An error occurred in line <1843> of file </home/smm/Work/deal.II/source/lac/sparse_direct.cc> in function void dealii::SparseDirectUMFPACK::factorize(const Matrix&) [with Matrix = dealii::SparseMatrix<double>] The violated condition was: false The name and call sequence of the exception was: ExcNeedsUMFPACK() Additional Information: (none) -------------------------------------------------------- Aborting! ---------------------------------------------------- DEAL::Solving linear system... make: *** [run] Error 1 any help would be appreciated . regards S.M.Mohseni
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