TOPIC: Can't submit reply to post. Get error code.

A number of times in the last few months I get the attached error message that "code is not correct" I believe I worked around it a time or two, but this time I can't.
I got it straightened out. I copied it over to a Word document and logged out and back in. Then I copied it from Word back to FG. I had already tried that, but didn't log out/on in between the copying.
Still would like to know what causes it so I can avoid it.

Don