The shell command
"/l/www/moodle/filter/tex/mimetex.linux" -e "/m/floppy/avle/moodledata/filter/tex/bdd09a6cca10bf53400edbb9fb9ec3c7.gif" -- '\Large \sum_{k=1}^{\infty} p_k'
returned status = 126
Image not found!
Please try the debugging script