The shell command
"/l/www/moodle/filter/tex/mimetex.linux" -e "/m/floppy/avle/moodledata/filter/tex/65cbbc4d6d8511891896d059db7e40e3.gif" -- '\Large
\nabla f = \mathrm{grad}\, f = \Big(\frac{\partial}{\partial x_1}f,\frac{\partial}{\partial x_2}f,\ldots,\frac{\partial}{\partial x_n}f\Big)\in\mathbb{R}^n.
'
returned status = 126
Image not found!
Please try the debugging script