The shell command
"/l/www/moodle/filter/tex/mimetex.linux" -e "/m/floppy/avle/moodledata/filter/tex/5e07c01c4e1f674f204e6a5ea47ad363.gif" -- '\Large \mathbf{r}(0)=(a,b)'
returned status = 126
Image not found!
Please try the debugging script