Not knowing the Text::CSV module at all, I read the error message like this:

"There is a CR - carriage return inside of your CSV data, but it is not at the end-of-line."

I understand: the operating system where you are getting this message is not using carriage return+line feed as the end-of-line marker, but maybe just the line feed.

This may seem strange, but maybe it is all there is to it.

Have you tried dos2unix or something similar on your data or would that break it?

If it doesn't succeed, the CR might be somewhere inside the data, not anywhere close to the end-of-line."

Cheers, Sören