Not knowing where to ask for help I write here, I installed the calendar plugin following this "tutorial" but when I run the command "lessc --relative-urls -x plugins/libkolab/skins/elastic/libkolab. less > plugins/libkolab/skins/elastic/libkolab.min.css" I get "/usr/local/share/gems/gems/less-2.6.0/bin/lessc:83:in <top (required)>': invalid option: --relative-urls (OptionParser::InvalidOption)
from /usr/local/bin/lessc:23:in
load'.
from /usr/local/bin/lessc:23:in `<main>'"
and of course the plugin does not work, the s.o is Centos Stream
so I was wondering if anyone had installed it without any problems and could help me find a solution