Hi,
I searched about this issue on the web, according to what I found out, the ID in the Google AdSense code in your website might be wrong, or you may have made a mistake when adding your website address to the Google AdSense settings. I'd like you to look into your Google AdSense account settings, to see if your website address is correctly spelled there, and to send me the Google AdSense code from your account, for me to check out if it matches the Google AdSense code in your website. Thanks!