Need help - Boolean won't work

When I run the code, everything works, except for the Boolean at the end. I have the code typed in, but when I run the code, I do not get asked whether I want to play again. The code simply shuts down. What am I doing wrong? See gist hub link. I am also pasting screenshot. Do the messages in the output box have anything to do with this? Thanks

Try rebuilding your project

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