[OS X TeX] context

[Doris Behrendt]

Hi all,

I want to use context with texshop; more precisely, I want to use mark iv which is LuaTeX-aware;
when I choose >>ConTeXt (LuaTeX)<< from the TS-dropdownmenu and start typesetting, I get

mtxrun          | unknown script 'context.lua' or 'mtx-context.lua'

I just updated to mactex 2018 and am running the actual version of TS;

can somebody give me a hint what I have to do?

tia
doris