The shell command
"/l/www/moodle/filter/tex/mimetex.linux" -e "/m/floppy/avle/moodledata/filter/tex/ff5abcc72f59b43c123400296b764d5e.gif" -- '\Large f\colon I\subset \mathbb{R} \to \mathbb{R}'
returned status = 126
Image not found!
Please try the debugging script