This says nothing about installing or setting up the BOM plugin on Mac OS X. I have downloaded the bom_csv_grouped_by_value.py plugin and placed it in Applications/Kicad/contents/plugins and I still get nothing.
All BOM scripts are meant to be run from within the BOM dialog of KiCad. So the question is what is the reason you do not use that? (What is the step that does not work there)
I am confused about the workaround. Please tell me, what’s the point of this forum if I can’t ask something? Why the hostility? What do I have to do to get help? Is there anyone else I can talk to?
Lets put it simple: I have no idea about Mac stuff. All I can do is point you do resources of someone else until somebody comes along that knows this stuff. The error message on that report was the same as what you have so it is a start. With a bit of luck the thing i point you do helps. If not then you at least know more and can give whoever comes later more detail.