This mwe gives the error below:
\starttext
{\spaceskip=1.0pt plus1pt minus1.5pt Matilda, 24, 345, 348, 361, 366}
\stoptext
Steffen
–––
… $ ~/context-osx-64/tex/texmf-osx-64/bin/mtxrun --script context
--autogenerate /Users/steffen/Desktop/error_1.tex
resolvers | formats | executing runner 'run luametatex format':
/Users/steffen/context-osx-64/tex/texmf-osx-64/bin/luametatex
--jobname="error_1"
--fmt=/Users/steffen/context-osx-64/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/formats/luametatex/cont-en.fmt
--lua=/Users/steffen/context-osx-64/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/formats/luametatex/cont-en.lui
--c:autogenerate --c:currentrun=1
--c:fulljobname="/Users/steffen/Desktop/error_1.tex"
--c:input="/Users/steffen/Desktop/error_1.tex" --c:kindofrun=1 --c:maxnofruns=9
--c:texmfbinpath="/Users/steffen/context-osx-64/tex/texmf-osx-64/bin"
fonts > beware: no fonts are loaded yet, using 'lm mono' in box
system >
system > ConTeXt ver: 2021.06.25 22:49 LMTX fmt: 2021.6.26 int:
english/english
system >
system > 'cont-new.mkxl' loaded
open source > level 1, order 1, name
'/Users/steffen/context-osx-64/tex/texmf-context/tex/context/base/mkxl/cont-new.mkxl'
system > beware: some patches loaded from cont-new.mkiv
close source > level 1, order 1, name
'/Users/steffen/context-osx-64/tex/texmf-context/tex/context/base/mkxl/cont-new.mkxl'
system > files > jobname 'error_1', input
'/Users/steffen/Desktop/error_1', result 'error_1'
fonts > latin modern fonts are not preloaded
languages > language 'en' is active
open source > level 1, order 2, name '/Users/steffen/Desktop/error_1.tex'
fonts > preloading latin modern fonts (second stage)
fonts > 'fallback modern-designsize rm 12pt' is loaded
tex error > tex error on line 4 in file
/Users/steffen/Desktop/error_1.tex: Valid keyword expected, likely 'minus'
<line 3.4> {\spaceskip=1.0pt plus1pt minus1.5pt Ma
tilda, 24, 345, 348, 361, 366}
1
2 \starttext
3
4 >> {\spaceskip=1.0pt plus1pt minus1.5pt Matilda, 24, 345, 348, 361, 366}
5
6 \stoptext
You started a keyword but it seems to be an invalid one. The first character(s)
might give you a clue. You might want to quit unwanted lookahead with \relax.
mtx-context | fatal error: return code: 256
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