Google announced that from the 30th of September Google AdMob will not support advertising/publishing for mobile sites anymore.Users, who are using AdMob for monetizing mobile sites, should now use AdSense instead, because AdMob will only support mobile apps, not sites.
The process will not be automatized, so users will have to create AdSense accounts by theirselves.
The AdMob ads will be shut down and the AdSense module will be prepared by next week.