I was running a perl app which uses /opt/local/lib/perl5/5.12.4/darwin-thread-multi-2level/Encode.pm
/opt/local/lib/perl5/5.12.4/darwin-thread-multi-2level/Encode.pm
and issues an error
Cannot deco
That error message is saying that you have passed in a string that has already been decoded (and contains characters above codepoint 255). You can't decode it again.