The shell command
"/l/www/moodle/filter/tex/mimetex.linux" -e "/m/floppy/avle/moodledata/filter/tex/87bd4dd5d30b975051f80b71f800bc01.gif" -- '\Large \displaystyle\begin{cases}\text{A}+\text{e}^- \rightarrow \text{B}\text{, }k_1 \\\text{B}+\text{e}^- \rightarrow \text{C}\text{, }k_2\end{cases} '
returned status = 126
Image not found!
Please try the debugging script