Hi Jean,
The following code is in v2.23.11 and it run OK.
\version "2.23.11"
\markup "test"
And the log file is :
Starting lilypond.exe 2.23.11 [Untitled (11)]...
Processing
`C:/Users/YMINGT~1/AppData/Local/Temp/frescobaldi-7krgt6o3/tmprbzc8juy/document.ly
<http://document.ly>'
Parsing...
Finding the ideal number of pages...
Fitting music on 1 page...
Drawing systems...
Converting to `document.pdf'...
Success: compilation successfully completed
Completed successfully in 1.4".
I am just querious about the error in v2.18.2.