Error message: "cannot read property length of undefined" in yahoo mail?-Collection of common programming errors

For the past 2 days, I have received the error message “cannot read property length of undefined” when trying to send an email in yahoo. The message appears in both Explorer and Google Chrome. I’m on my work computer, so I will be unable to do any ‘crazy’ stuff to fix this. Anyone have an easy fix?

Originally posted 2013-11-09 21:09:22.