Markdown - Footnotes - MultiMarkdown

Dear Colleagues, maybe some of you have encountered this problem and can help.
When I paste /Applications/Scrivener.app/Contents/Resources/MultiMarkdown/bin/multimarkdown in $HTMLPrewiewCommand (I checked it is really in this folder) I get the following error in preview:



If I paste /usr/local/bin/mmd then some of the syntax doesn’t work (formulas in LaTeX and CriticMarkup). Can you tell me how to get it to work. I am probably doing something wrong.