## WeBWorK Main Forum

### Argument "" isn't numeric in localtime

by Tom Hall -
Number of replies: 4
We are getting the following error messages at the bottom of the Homework Sets page (the one that appears on login) and the Gateway Quiz page respectively. These messages are occuring in only one course and the second is only appearing on some Gateway Quizzes.

Does anyone have a suggestion as to the cuase and cure for this.

We are new to WebWork here at Brock University so I hope I am posting this to the correct forum.

Thanks

Tom

## WeBWorK Warnings

WeBWorK has encountered warnings while processing your request. If this occured when viewing a problem, it was likely caused by an error or ambiguity in that problem. Otherwise, it may indicate a problem with the WeBWorK system itself. If you are a student, report these warnings to your professor to have them corrected. If you are a professor, please consult the warning output below for more information.

### Warning messages

• Argument "" isn't numeric in localtime at /usr/local/webwork/webwork2/lib/WeBWorK/ContentGenerator/ProblemSets.pm line 469.

### Request information

 Time Mon Jun 22 14:31:55 2009 Method POST URI /webwork2/MathSkills/

## WeBWorK Warnings

WeBWorK has encountered warnings while processing your request. If this occured when viewing a problem, it was likely caused by an error or ambiguity in that problem. Otherwise, it may indicate a problem with the WeBWorK system itself. If you are a student, report these warnings to your professor to have them corrected. If you are a professor, please consult the warning output below for more information.

### Warning messages

• Argument "" isn't numeric in numeric gt (>) at /usr/local/webwork/webwork2/lib/WeBWorK/ContentGenerator/GatewayQuiz.pm line 644.

### Request information

 Time Mon Jun 22 15:39:49 2009 Method GET URI /webwork2/MathSkills/quiz_mode/Math_Skills_Test_05/

In reply to Tom Hall

### Re: Argument "" isn't numeric in localtime

by Gavin LaRose -
Hi Tom,

This is a good question. My best guess without having additional data is that it's a result of a partially created gateway assignment, which guess is wrong if this is occurring for users who have completed the assignment.

What version of WeBWorK are you using? (That will let me find more accurately what line is throwing the error.)

The error looks as if it may be a result of the creation time for a set version not being correctly defined, which I think could occur if there was an error when the user went to start the set.

Thanks,
Gavin
In reply to Gavin LaRose

### Re: Argument "" isn't numeric in localtime

by Tom Hall -
Hi Gavin

Thanks for the input. Below are 2 error messages and some MySQL query output (I have changed the user_id fields due to our privacy laws).

The error messages below were obtained by user1, user2 did not get any error messages today, although he did yesterday. All of the sample data below was gathered from a freshly created gateway quiz using the same problem groups as previous tests with the same errors. Note on v1 of the test user1 got a null version_creation_time in the database. Similarly, the errors are on lines that reference the version_creation_time variable.

Tom

WeBWorK Warnings

WeBWorK has encountered warnings while processing your request. If
this occured when viewing a problem, it was likely caused by an error
or ambiguity in that problem. Otherwise, it may indicate a problem
with the WeBWorK system itself. If you are a student, report these
warnings to your professor to have them corrected. If you are a
professor, please consult the warning output below for more information.
Warning messages

* Argument "" isn't numeric in numeric gt (>) at
/usr/local/webwork/webwork2/lib/WeBWorK/ContentGenerator/GatewayQuiz.pm line
644.

Request information
Time Tue Jun 23 13:29:02 2009
Method GET
URI /webwork2/MathSkills/quiz_mode/Math_Skills_Test_04/

WeBWorK Warnings

WeBWorK has encountered warnings while processing your request. If
this occured when viewing a problem, it was likely caused by an error
or ambiguity in that problem. Otherwise, it may indicate a problem
with the WeBWorK system itself. If you are a student, report these
warnings to your professor to have them corrected. If you are a
professor, please consult the warning output below for more information.
Warning messages

* Argument "" isn't numeric in localtime at
/usr/local/webwork/webwork2/lib/WeBWorK/ContentGenerator/ProblemSets.pm line
469.

Request information
Time Tue Jun 23 13:35:39 2009
Method GET
URI /webwork2/MathSkills/

select set_id, user_id, open_date, due_date, published, time_interval, version_time_limit, version_creation_time from MathSkills_set_user where set_id like '%Test_04%' order by set_id, user_id;

| Math_Skills_Test_04,v1 | user1 | 1244552700 | 1529154300 | 1 | 60 | 1800 | NULL |
| Math_Skills_Test_04,v1 | user2 | 1245768927 | 1245770727 | 1 | 60 | 1800 | 1245768927 |
| Math_Skills_Test_04,v2 | user1 | 1245778139 | 1245779939 | 1 | 60 | 1800 | 1245778139 |
| Math_Skills_Test_04,v3 | user1 | 1245778431 | 1245780231 | 1 | 60 | 1800 | 1245778431 |
+------------------------+------------+------------+------------+-----------+---------------+--------------------+-----------------------+

select user_id, set_id, problem_id, source_file from MathSkills_problem_user where set_id like '%Test_04%';

| user1 | Math_Skills_Test_04,v1 | 1 | Library/Rochester/setAlgebra28ExpFunctions/srw4_1_1.pg |
| user1 | Math_Skills_Test_04,v1 | 2 | Library/ASU-topics/setExponentialFunctions/srw4_1_29.pg |
| user1 | Math_Skills_Test_04,v1 | 3 | Library/Rochester/setAlgebra28ExpFunctions/srw4_1_33.pg |
| user1 | Math_Skills_Test_04,v1 | 4 | Library/Rochester/setAlgebra31LogExpApplications/decay2.pg |
| user1 | Math_Skills_Test_04,v1 | 5 | Library/ASU-topics/setLogarithmicFunctions/beth1.pg |
| user1 | Math_Skills_Test_04,v1 | 6 | Library/ASU-topics/setLogarithmicFunctions/srw4_3_41-42.pg |
| user1 | Math_Skills_Test_04,v1 | 7 | Library/Rochester/setAlgebra29LogFunctions/beth1logfun.pg |
| user1 | Math_Skills_Test_04,v1 | 8 | Library/ASU-topics/setLogarithmicFunctions/jj1.pg |
| user1 | Math_Skills_Test_04,v1 | 9 | Library/Rochester/setAlgebra30LogExpEqns/srw4_2_23.pg |
| user2 | Math_Skills_Test_04,v1 | 1 | Library/ASU-topics/setExponentialFunctions/srw4_1_3.pg |
| user2 | Math_Skills_Test_04,v1 | 2 | Library/ASU-topics/setExponentialFunctions/srw4_1_31.pg |
| user2 | Math_Skills_Test_04,v1 | 3 | Library/Rochester/setAlgebra28ExpFunctions/srw4_1_9.pg |
| user2 | Math_Skills_Test_04,v1 | 4 | Library/Rochester/setAlgebra31LogExpApplications/srw4_5_21.pg |
| user2 | Math_Skills_Test_04,v1 | 5 | Library/Rochester/setAlgebra29LogFunctions/problem1.pg |
| user2 | Math_Skills_Test_04,v1 | 6 | Library/ASU-topics/setLogarithmicFunctions/beth3logfun.pg |
| user2 | Math_Skills_Test_04,v1 | 7 | Library/ASU-topics/setLogarithmicFunctions/jj2.pg |
| user2 | Math_Skills_Test_04,v1 | 8 | Library/ASU-topics/setLogarithmicFunctions/srw4_5_10.pg |
| user2 | Math_Skills_Test_04,v1 | 9 | Library/Rochester/setAlgebra30LogExpEqns/srw4_4_72.pg |
| user2 | Math_Skills_Test_04,v1 | 10 | Library/Rochester/setAlgebra30LogExpEqns/problem15.pg |
| user1 | Math_Skills_Test_04,v2 | 1 | Library/Michigan/Chap1Sec2/Q38.pg |
| user1 | Math_Skills_Test_04,v2 | 2 | Library/Rochester/setAlgebra28ExpFunctions/ur_le_1_5.pg |
| user1 | Math_Skills_Test_04,v2 | 3 | Library/Michigan/Chap1Sec2/Q20.pg |
| user1 | Math_Skills_Test_04,v2 | 4 | Library/ASU-topics/setExponentialFunctions/sw6_2_13.pg |
| user1 | Math_Skills_Test_04,v2 | 5 | Library/Rochester/setAlgebra29LogFunctions/sw6_3_13.pg |
| user1 | Math_Skills_Test_04,v2 | 6 | Library/Rochester/setAlgebra29LogFunctions/sw6_3_3.pg |
| user1 | Math_Skills_Test_04,v2 | 7 | Library/Rochester/setAlgebra29LogFunctions/srw4_2_59.pg |
| user1 | Math_Skills_Test_04,v2 | 8 | Library/ASU-topics/setLogarithmicFunctions/srw4_5_10.pg |
| user1 | Math_Skills_Test_04,v2 | 9 | Library/Rochester/setAlgebra30LogExpEqns/problem4.pg |
| user1 | Math_Skills_Test_04,v2 | 10 | Library/Rochester/setAlgebra30LogExpEqns/problem8.pg |
| user1 | Math_Skills_Test_04,v3 | 1 | Library/Michigan/Chap1Sec4/Q39.pg |
| user1 | Math_Skills_Test_04,v3 | 2 | Library/Rochester/setAlgebra28ExpFunctions/ur_log_1_3.pg |
| user1 | Math_Skills_Test_04,v3 | 3 | Library/Rochester/setAlgebra28ExpFunctions/srw4_1_11.pg |
| user1 | Math_Skills_Test_04,v3 | 4 | Library/Michigan/Chap1Sec4/Q36.pg |
| user1 | Math_Skills_Test_04,v3 | 5 | Library/Rochester/setAlgebra29LogFunctions/srw4_3_49.pg |
| user1 | Math_Skills_Test_04,v3 | 6 | Library/Rochester/setAlgebra29LogFunctions/sw6_3_3.pg |
| user1 | Math_Skills_Test_04,v3 | 7 | Library/Rochester/setAlgebra29LogFunctions/srw4_2_59.pg |
| user1 | Math_Skills_Test_04,v3 | 8 | Library/ASU-topics/setLogarithmicFunctions/srw4_5_1.pg |
| user1 | Math_Skills_Test_04,v3 | 9 | Library/Rochester/setAlgebra30LogExpEqns/srw4_4_72.pg |
| user1 | Math_Skills_Test_04,v3 | 10 | Library/Rochester/setAlgebra30LogExpEqns/srw4_2_37.pg |

In reply to Tom Hall

### Re: Argument "" isn't numeric in localtime

by Gavin LaRose -
Hi Tom,

That's very informative. The problem is in the first version of the set for user 1, which shows a NULL creation time.:
| Math_Skills_Test_04,v1 | user1 | 1244552700 | 1529154300 | 1 | 60 | 1800 | NULL |
I would be very interested in knowing how it got the null creation time, because that shouldn't occur. The quick work-around for this particular case is to put in a reasonable value manually:
mysql> update MathSkills_set_user set version_creation_time=open_date where set_id='Math_Skills_Test_04,v1' and user_id='user1';

The real question is how the set got created without having the creation time initialized. If you know anything that would have been odd about how that set was created please let me know. I'll go back and look at the code to see if I can figure out what went wrong, too.

What version of WeBWorK are you using?

Thanks,
Gavin
In reply to Gavin LaRose

### Re: Argument "" isn't numeric in localtime

by Tom Hall -
Hi Gavin

We are using 2.4.5 downloaded late November or early December 2008.

Thanks

Tom