Dear Professor, I was running the petsc test using  # make all test -j AND I got the error code 1 message of six examples. What is error code 1 and how can location the error. I went the exactly file and make, it seems the examples can be running well. I don't understand what is error code 1. The below is the summary. Looking forward to hearing you! ----- #   Summary # ------------- # FAILED diff-tao_complementarity_tutorials-blackscholes_2 diff-tao_bound_tutorials-plate2f_2 diff-tao_complementarity_tutorials-blackscholes_6 diff-tao_bound_tutorials-plate2f_1 diff-vec_is_is_tutorials-ex2f_1 diff-tao_complementarity_tutorials-blackscholes_7 # success 7544/9528 tests (79.2%) # failed 6/9528 tests (0.1%) # todo 225/9528 tests (2.4%) # skip 1753/9528 tests (18.4%) # # Wall clock time for tests: 1552 sec # Approximate CPU time (not incl. build time): 106566.87999999993 sec # # To rerun failed tests: #     /opt/rh/devtoolset-9/root/usr/bin/gmake -f gmakefile test test-fail=1 # # Timing summary (actual test time / total CPU time): #   mat_tests-ex44_mpiio_15: 220.10 sec / 221.33 sec #   mat_tests-ex44_stdio_15: 220.07 sec / 221.15 sec #   dm_impls_stag_tests-ex1_basic_2: 209.29 sec / 211.16 sec #   dm_tutorials-ex15_3: 177.42 sec / 178.46 sec #   dm_impls_stag_tutorials-ex6_4: 177.10 sec / 178.31 sec Best, Gang Chen Sichuan Univertsity, School of Mathematics, Chengdu, China