The shell command
"/l/www/moodle/filter/tex/mimetex.linux" -e "/m/floppy/avle/moodledata/filter/tex/d9765d5f801ccb7355a111fc017d0186.gif" -- '\Large \displaystyle E_{\text{cell}}=E^0+\frac{RT}{F} \ln \left[\frac{a_{\text{Fe}^{3+}}(a_{\text{H}_2})^{1/2}}{a_{\text{Fe}^{2+}}a_{\text{H}^{+}}}\right] '
returned status = 126
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Please try the debugging script