The shell command
"/l/www/moodle/filter/tex/mimetex.linux" -e "/m/floppy/avle/moodledata/filter/tex/390690efe714ba562a69e4b1a9e68af1.gif" -- '\Large \frac{f(x_0+h)-f(x_0)}{x_0+h-x_0} = \frac{f(x_0+h)-f(x_0)}{h}.'
returned status = 126
Image not found!
Please try the debugging script