[LON-CAPA-admin] Course Map Undefined Error

[Stuart Raeburn]

Hi Joyce,

The error message: 'Coursemap undefined' will be shown when a student  
attempts to display the Course Contents screen, when either or both of  
the following items:

map_start_/uploaded/purdue/<coursenum>/default.sequence
map_end_/uploaded/purdue/<coursenum>/default.sequence

are absent from the user's course session hash, found in the GDBM file:

/home/httpd/perl/tmp/<username>_<courseid>.db

where <courseid> is the LON-CAPA course ID, e.g.,  
purdue_22608011029874510purduel1

On the command line you can use the script: /home/httpd/perl/debug/dump_db.pl
to view the contents of a GDBM file in LON-CAPA.

The perl module which performs the page flip in response to a student  
pressing either the forward or backward green arrow is:  
/home/httpd/lib/perl/Apache/lonpageflip.pm.

> It appears that when scrolling through  problems using the Green  
> Arrow, the problem takes a long time to  load.

Is the issue always with the same problem?  What resource is it?  Is  
there discussion attached to the instance of the problem in the course?

If you are able to reproduce this error, what are the timestamps for  
the GDBM files:

/home/httpd/perl/tmp/<username>_<courseid>.db
/home/httpd/perl/tmp/<username>_<courseid>_parms.db

for your user session when this occurs?  Were they recently created,  
for example because the course contents were updated by a Course  
Coordinator within the past 20 minutes?


Stuart Raeburn
LON-CAPA Academic Consortium

Quoting "Young, Joyce E" <young257 at purdue.edu>:

> We are having issues in one of our courses with students receiving a  
>  "Course Map Undefined" error. It appears that when scrolling  
> through  problems using the Green Arrow, the problem takes a long  
> time to  load. The students then go to Course Contents to try to  
> access the  problem in a different fashion, and then they get the  
> "Course Map  Undefined" error. They seem to have to log out and  
> login to get back  to the problem.
> If they refresh the page instead of clicking on Contents, it gives   
> them "End of Sequence". Since they are not done, they still have to   
> click on Contents, which gives them the "Course Map Undefined" error.
> Please advise.
>                                                                 Thanks,
>                                                                       
>             Joyce Young
>
> Joyce Young
> Programmer/Analyst
> ITAS - Student Systems Competency Center
> Purdue University
> 3495 Kent Avenue, Suite 100
> West Lafayette, IN 47906
> Phone: (765) 427-6340
> Fax: (765) 464-2233
> Campus Mail: ROSS
> young257 at purdue.edu<mailto:young257 at purdue.edu>