guys,blog help!

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guys,I just signed up on blogger but when i try to add adsense, they don't approve because my URL is down or unavailable. What does this exactly mean? I do not have a story there yet. Should I put one first before resubmitting my request for adsense? How do I see my URL? is it related to the story I must put in first? No story, no URL to specify? Am so newbie. Thank you for help...