Ok, I dusted off my old Cygwin terminal and got Term::ANSIColor working. grey0 looks the same as black, but prints fine with no error message. grey with no number gives the error message you reported first.

I don’t know what to suggest. Maybe if you detail your setup (OS, Perl version, Term::ANSIColor version, terminal type) some of the other monks will be able to shed some light.

Cheers,