Hello, I created a code for solving the finite element method using the PCBDDC method according to ex71, but I got the following error at the end, I can't find out the cause of the error, can you tell me what the error is based on the error message? (PS. I have tried: Mat AA. PetscCall(MatConvert(A, MATAIJ, MAT_INITIAL_MATRIX, &AA)). to change the matrix type and then solve for AA, it works fine) [0]PETSC ERROR: --------------------- Error Message -------------------------------------------------------------- [1]PETSC ERROR: --------------------- Error Message -------------------------------------------------------------- [0]PETSC ERROR: [1]PETSC ERROR: Error in external library Error in external library [0]PETSC ERROR: [1]PETSC ERROR: Error in query to SYEV Lapack routine 0 Error in query to SYEV Lapack routine 0 [0]PETSC ERROR: [1]PETSC ERROR: See https://petsc.org/release/faq/ for trouble shooting. See https://petsc.org/release/faq/ for trouble shooting. [0]PETSC ERROR: [1]PETSC ERROR: Petsc Development GIT revision: unknown GIT Date: unknown Petsc Development GIT revision: unknown GIT Date: unknown [0]PETSC ERROR: [1]PETSC ERROR: test_petsc_fem.exe on a arch-mswin-c-debug named lmeep-329 by XiongZiming Wed May 31 16:52:36 2023 test_petsc_fem.exe on a arch-mswin-c-debug named lmeep-329 by XiongZiming Wed May 31 16:52:36 2023 [0]PETSC ERROR: [1]PETSC ERROR: Configure options --with-cc=/cygdrive/f/post_doc_C++/petsc_new/petsc-main/lib/petsc/bin/win32fe/win_cl --with-cxx=/cygdrive/f/post_doc_C++/petsc_new/petsc-main/lib/petsc/bin/win32fe/win_cl --with-fc=0 --download-metis --with-shared-libraries=0 --with-mpi-include="[/cygdrive/c/PROGRA~2/Intel/MPI/Include,/cygdrive/c/PROGRA~2/Intel/MPI/Include/x64]" --with-mpi-lib="-L/cygdrive/c/PROGRA~2/Intel/MPI/lib/x64 msmpifec.lib msmpi.lib" --with-mpiexec=/cygdrive/c/PROGRA~1/Microsoft_MPI/Bin/mpiexec --with-blaslapack-lib="-L/cygdrive/c/PROGRA~2/Intel/oneAPI/mkl/latest/lib/intel64 mkl_intel_lp64_dll.lib mkl_sequential_dll.lib mkl_core_dll.lib" --with-64-bit-indices --with-mkl_pardiso-dir=/cygdrive/c/PROGRA~2/Intel/oneAPI/mkl/latest Configure options --with-cc=/cygdrive/f/post_doc_C++/petsc_new/petsc-main/lib/petsc/bin/win32fe/win_cl --with-cxx=/cygdrive/f/post_doc_C++/petsc_new/petsc-main/lib/petsc/bin/win32fe/win_cl --with-fc=0 --download-metis --with-shared-libraries=0 --with-mpi-include="[/cygdrive/c/PROGRA~2/Intel/MPI/Include,/cygdrive/c/PROGRA~2/Intel/MPI/Include/x64]" --with-mpi-lib="-L/cygdrive/c/PROGRA~2/Intel/MPI/lib/x64 msmpifec.lib msmpi.lib" --with-mpiexec=/cygdrive/c/PROGRA~1/Microsoft_MPI/Bin/mpiexec --with-blaslapack-lib="-L/cygdrive/c/PROGRA~2/Intel/oneAPI/mkl/latest/lib/intel64 mkl_intel_lp64_dll.lib mkl_sequential_dll.lib mkl_core_dll.lib" --with-64-bit-indices --with-mkl_pardiso-dir=/cygdrive/c/PROGRA~2/Intel/oneAPI/mkl/latest [0]PETSC ERROR: [1]PETSC ERROR: #1 PCBDDCConstraintsSetUp() at F:\post_doc_C++\petsc_new\petsc-main\src\ksp\pc\impls\bddc\bddcprivate.c:5975 #1 PCBDDCConstraintsSetUp() at F:\post_doc_C++\petsc_new\petsc-main\src\ksp\pc\impls\bddc\bddcprivate.c:5975 [0]PETSC ERROR: [1]PETSC ERROR: #2 PCSetUp_BDDC() at F:\post_doc_C++\petsc_new\petsc-main\src\ksp\pc\impls\bddc\bddc.c:1659 #2 PCSetUp_BDDC() at F:\post_doc_C++\petsc_new\petsc-main\src\ksp\pc\impls\bddc\bddc.c:1659 [0]PETSC ERROR: [1]PETSC ERROR: #3 PCSetUp() at F:\post_doc_C++\petsc_new\petsc-main\src\ksp\pc\interface\precon.c:994 #3 PCSetUp() at F:\post_doc_C++\petsc_new\petsc-main\src\ksp\pc\interface\precon.c:994 [1]PETSC ERROR: [0]PETSC ERROR: #4 KSPSetUp() at F:\post_doc_C++\petsc_new\petsc-main\src\ksp\ksp\interface\itfunc.c:406 #4 KSPSetUp() at F:\post_doc_C++\petsc_new\petsc-main\src\ksp\ksp\interface\itfunc.c:406 [1]PETSC ERROR: [0]PETSC ERROR: #5 petsc_calcul_part_DMDA() at petsc_DMDA.cpp:285 #5 petsc_calcul_part_DMDA() at petsc_DMDA.cpp:285 [1]PETSC ERROR: [0]PETSC ERROR: #6 main() at ..\Main.cpp:281 #6 main() at ..\Main.cpp:281 [1]PETSC ERROR: [0]PETSC ERROR: No PETSc Option Table entries No PETSc Option Table entries [1]PETSC ERROR: [0]PETSC ERROR: ----------------End of Error Message -------send entire error message to [email protected] ----------------End of Error Message -------send entire error message to [email protected] job aborted: [ranks] message [0-1] application aborted aborting MPI_COMM_SELF (comm=0x44000001), error 76, comm rank 0 ---- error analysis ----- [0-1] on lmeep-329 test_petsc_fem.exe aborted the job. abort code 76 ---- error analysis ----- Ziming XIONG