You may be unfortunate enough to get this error when you try to switch on AdSense for your Blogger blog:
"The publisher must be associated with the developer account before the developer can invoke operations on the publisher's account."
Don't stress, you just need to go to
your Google AdSense account -> My Account -> Account Access
Now under where it says "Hosts with access" you may/should have a blogger.com entry with a link next to it "grant access".
Click the link, confirm, and you're back in business :)