I think this has something to do with adsense. I created an adsense account, tried to put some ads on, then this "webpage cannot be found" keeps showing up at the top of my sidebar. I cancelled my adsense account, removed all the code from my blog, and it's still there. I think it has something to do with adsense, because when I right click on the image and look under properties, this is the URL that shows:
I am very new at this and really don't know much about what I'm doing, but I would really like this off of there.