The shell command
"/l/www/moodle/filter/tex/mimetex.linux" -e "/m/floppy/avle/moodledata/filter/tex/b013411dfd804f02f65e8c2c55791353.gif" -- '\Large y=\sup_{x\in [a,b]} f(x)>y-\frac{1}{k}'
returned status = 126
Image not found!
Please try the debugging script