Description: ReText package doesn't start, when launching from menu there is no action, launching within a terminal I have following messages

[anonymous@Sulfur ~]$ retext &
[1] 4433
[anonymous@Sulfur ~]$ Using configuration file: /home/anonymous/.config/ReText project/ReText.conf
Traceback (most recent call last):
File "/usr/bin/retext", line 111, in <module>
main()
File "/usr/bin/retext", line 79, in main
window = ReTextWindow()
File "/usr/lib/python3.6/site-packages/ReText/window.py", line 224, in __init__
availableMarkups = markups.get_available_markups()
File "/usr/lib/python3.6/site-packages/markups/__init__.py", line 33, in get_available_markups
for markup in get_all_markups():
File "/usr/lib/python3.6/site-packages/markups/__init__.py", line 23, in get_all_markups
return [entry_point.load() for entry_point in entry_points]
File "/usr/lib/python3.6/site-packages/markups/__init__.py", line 23, in <listcomp>
return [entry_point.load() for entry_point in entry_points]
File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2317, in load
self.require(*args, **kwargs)
File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2340, in require
items = working_set.resolve(reqs, env, installer, extras=self.extras)
File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 774, in resolve
raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'python-markdown-math' distribution was not found and is required by the application

I search for python-markdown-math package and I don't find it, tried to search with pacman -Ss markdown | grep math => no answer
I installed all (64 bits) packages given by pacman -Ss python | grep markdown

No solution for moment.


Steps to reproduce: