Unexpected I/O error during deserialization

I was trying to make a help window that has a textbox filled with some lengthy instruction. after saving I receive the error message in the subject when trying to open the window. I have provided the window as an attachment.
textboxWindow.fwin (71.3 KB)

The error that you were getting was about invalid UTF-8 encoding. It looks like there were some invalid character sequences in the characters that were quoting the name of the book “Introduction to Statistical Quality Control”. Where did you copy and paste that bit from?

Here is a fixed version of the window where I used double quotes to replace those odd characters.
textboxWindow_fixed.fwin (71.3 KB)

Microsoft Word.

Huh, think you could send that word doc to me?