The shell command
"/srv/www/0003_site/releases/4.1.17-6-dev/filter/tex/mimetex.linux" -e "/srv/www/0003_site/media/media_moodle/filter/tex/48b0c0899579ff296e9e96c6ef9e4c4d.gif" -- '\Large a_3'
returned status = 126
Image not found!
Please try the debugging script