In 2007, Google formed an integration deal with GoDaddy to enable GoDaddy hosting users to easily verify their sites with Google Webmaster Tools.
Sometime recently that verification process broke.
A Google Webmaster Help thread has one GoDaddy user complaining about this issue. He described it as follows:
Googler, Susan Moskwa explained they are aware of the issue and is working with GoDaddy to have it resolved. She said:
Forum discussion at Google Webmaster Help.