even on your provided fla i get the error. without any modifications. Only the xml was edited as per instructions and still LABEL GOES HERE appears on mouse over.
I found out what the problem was. When I opened the .FLA it said that some fonts where missing. I automatically put - use default fonts - and that's where the problem arrived. I closed the file and replaced the missing font with Arial and its working fine now. Don't know why it did that but I got it to work at the end.