** Using WeBWorK **

[1] WebWork2.3.0 (dvipng 1.5; /usr/share/texmf/tex/latex/preview/preview.sty)

[2] After I use the "images" display, it gave me error:

DBD::mysql::st execute failed: Table 'webwork.depths' doesn't exist at /opt/webwork/pg/lib/WeBWorK/PG/ImageGenerator.pm line 438. DBD::mysql::st execute failed: Table 'webwork.depths' doesn't exist at /opt/webwork/pg/lib/WeBWorK/PG/ImageGenerator.pm line 438. DBD::mysql::st execute failed: Table 'webwork.depths' doesn't exist at /opt/webwork/pg/lib/WeBWorK/PG/ImageGenerator.pm line 438

Error messages Can't use an undefined value as an ARRAY reference at /opt/webwork/pg/lib/WeBWorK/PG/ImageGenerator.pm line 434.

Request information Method POST URI /webwork2/mytestcourse/instructor/setmaker/ HTTP Headers User-Agent Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; YPC 3.2.0; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727; yplus 5.1.02b) Accept image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */* Connection Keep-Alive Referer http://147.126.65.147/webwork2/mytestcourse/instructor/setmaker/ Content-Length 1899 Accept-Encoding gzip, deflate Cache-Control no-cache Content-Type multipart/form-data; boundary=---------------------------7d636128630900 Accept-Language en-us,zh-cn;q=0.7,zh;q=0.3

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I believe this is because it's possible to have the baseline alignment of dvipng images stored in a mysql database table. To avoid this (and therefore get rid of the error), you can set the alignment in the webwork global.conf file. Look for the lines

$pg{displayModeOptions}{images} = {
        # Determines the method used to align images in output. Can be
        # "baseline", "absmiddle", or "mysql".
        dvipng_align => 'baseline',

and make sure that dvipng_align is set to something other than mysql.

I think the other solution is to set up the table in the database, but in that I use dvipng rarely at this point I didn't bother with that.

Gavin

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Thank you. I changed it to 'baseline'. It is working.

--Miao

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