The shell command
"/var/www/moodle/filter/tex/mimetex.linux" -e "/mnt/efs/moodledata/filter/tex/12f258ffa04470f30a7143ccae3fa129.svg" -- '\Large {\begin{aligned}&\operatorforbiddenkeyword_name {P} (X_{v}=x_{v}\mid X_{i}=x_{i}{\text{ for each }}X_{i}{\text{ that is not a descendant of }}X_{v}\,)\\[6pt]={}&P(X_{v}=x_{v}\mid X_{j}=x_{j}{\text{ for each }}X_{j}{\text{ that is a parent of }}X_{v}\,)\end{aligned}}'
returned status = 126
Image not found!
Please try the debugging script