"Bad URL"

I have made a game, and I want to release it, so I pressed the published button on the game-salad app and it took me to a page on the internet. I finished all of the things on the page such as Title, custom loading image etc... and i clicked generate app. It took a few minuets to do this which was fine, and then I clicked on the sign app button and all that happened was a pop-up saying that there was a bad URL. WHAT DOES THIS MEAN!!!!!! and how can i fix it. My user name doesn't have any spaces on it, but it does have an under score. Could that be why it isn't working.
Thank you so much for helping.
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