$ perl -Mautodie=binmode -e "binmode STDOUT, rabbits"
Unknown PerlIO layer "rabbits" at (eval 3) line 67.
Can't binmode('STDOUT', 'rabbits'): No such file or directory at -e li
+ne 1

$ perl -Mautodie=binmode -e "binmode STDOUT, encodinig"
Unknown PerlIO layer "encodinig" at (eval 3) line 67.
Can't binmode('STDOUT', 'encodinig'): No such file or directory at -e 
+line 1
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You can ignore errno "No such file or directory" part of the message, but not "Unknown PerlIO layer"