in a homework set, one problem from 11 is missed for some students. I checked Edit individual versions of set for those students and I got the error show below. I reviewed the problem missed (Library/UCSB/Stewart5_1_6/Stewart5_1_6_1.pg) and looks OK for me.
ww_version: 2.11 | pg_version: 2.11
Thanks in advance.Error messages Can't call method "source_file" on an undefined value at /opt/webwork/webwork2/lib/WeBWorK/ContentGenerator/Instructor/ProblemSetDetail2.pm line 2370. Call stack The information below can help locate the source of the problem. in WeBWorK::ContentGenerator::Instructor::ProblemSetDetail2::body called at line 155 of /opt/webwork/webwork2/lib/WeBWorK/Template.pm in WeBWorK::Template::template called at line 531 of /opt/webwork/webwork2/lib/WeBWorK/ContentGenerator.pm in WeBWorK::ContentGenerator::content called at line 203 of /opt/webwork/webwork2/lib/WeBWorK/ContentGenerator.pm in WeBWorK::ContentGenerator::go called at line 382 of /opt/webwork/webwork2/lib/WeBWorK.pm