## WeBWorK Problems

### Problem fails for one specific student

by David Brodbeck -
Number of replies: 5

I'm at a bit of a loss for how to troubleshoot this one.

The problem Library/Hope/Multi1/04-01-Linear-transformations/Lin_trans_11.pg works for everyone except one student. When Webwork tries to render the problem page for him. It errors out with the following:

## Error messages

'require' trapped by operation mask at /usr/lib64/perl5/vendor_perl/Encode.pm line 5. Compilation failed in require at /usr/lib64/perl5/vendor_perl/Encode/Alias.pm line 22.

## Call stack

The following information can help locate the source of the problem.

• in WeBWorK::PG::Local::new called at line 51 of /opt/webwork/webwork2/lib/WeBWorK/PG.pm
• in WeBWorK::PG::new called at line 738 of /opt/webwork/webwork2/lib/WeBWorK/ContentGenerator/Problem.pm
• in WeBWorK::ContentGenerator::Problem::pre_header_initialize called at line 213 of /opt/webwork/webwork2/lib/WeBWorK/ContentGenerator.pm
• in WeBWorK::ContentGenerator::go called at line 386 of /opt/webwork/webwork2/lib/WeBWorK.pm
Any suggestions on how to proceed? The fact that I can only reproduce it when acting as him is hard for me to figure out.

### Re: Problem fails for one specific student

by Paul Vojta -

What is the user's random seed?  If you change your random seed to that value, does the error occur for you?

### Re: Problem fails for one specific student

by David Brodbeck -
Good question. Where would I find the random seed?

### Re: Problem fails for one specific student

by Glenn Rice -

One way to find it is to open the set in the "Hmwk Sets Editor", click on "Edit individual versions of set setname," and then click on "Edit data for username" for that user.  The seed will be listed in the "User Value" for the problem settings for that problem.

### Re: Problem fails for one specific student

by David Brodbeck -
Thanks. I found their seed and changed mine to match, and now the problem fails for me, too.

So I suppose a quick fix would be to give them a different seed for that one problem? (The problematic seed is 4283, if it matters.)