I just want to save my preferred domain as www.example.com
in Webmaster Tools but it simply shows the following error message:
Part of the process of setting a preferred domain is to verify that you own
http://example.com/
. Please verifyhttp://example.com/
.
I can't save the setting, any idea why this is happening?
Note: I already verified the www version, I have no idea to verify the no-www version.