Mathematics tools

Sorry you are having problems here. You probably need to look at the post install "healthcheck" file for more information on what is going wrong.
https://github.com/maths/moodle-qtype_stack/blob/master/doc/en/Installation/Testing_installation.md
If you still have problems, email me at C.J.Sangwin@ed.ac.uk and we can discuss this off the list.
Chris