The shell command
"/l/www/moodle/filter/tex/mimetex.linux" -e "/m/floppy/avle/moodledata/filter/tex/206131a9269aea40ab3989d9519bd51a.gif" -- '\Large
\binom{n}{k} =\frac{n!}{k!(n-k)!} = \frac{n(n-1)(n-2)\dots (n-k+1)}{k!}.
'
returned status = 126
Image not found!
Please try the debugging script