The shell command
"/l/www/moodle/filter/tex/mimetex.linux" -e "/m/floppy/avle/moodledata/filter/tex/f861c5671ab33768cf25875b2723be23.gif" -- '\Large \displaystyle1-e^{a^2t}\text{erfc}({a\sqrt{t}}) '
returned status = 126
Image not found!
Please try the debugging script