The shell command
"/l/www/moodle/filter/tex/mimetex.linux" -e "/m/floppy/avle/moodledata/filter/tex/c7036a1d4cbde5b95c33896c572cacfa.gif" -- '\Large \displaystyle r=k_{red}c_{\text{O}}^s-k_{ox}c_{\text{R}}^s '
returned status = 126
Image not found!
Please try the debugging script