The shell command
"/l/www/moodle/filter/tex/mimetex.linux" -e "/m/floppy/avle/moodledata/filter/tex/26eba8ddfa84991111e21d26debdd052.gif" -- '\Large F\left(\phi^{\beta}-\phi^{\alpha}\right)=\mu_{\text{e}^-}^{\beta}-\mu_{\text{e}^-}^{\alpha} '
returned status = 126
Image not found!
Please try the debugging script