no it wouldnt and tbh, the code hasnt changed,
the trigger command was just undocumented.
the only reason you would get an error like
ON unknown command
is a syntax error, example:
on :text::#: {
bla bla
on :action::#: {
bla bla
}
please click the lil bracket checker button in your script editor,
and see if it tells you where the missing bracket is,
mine is all fine.