Using google webmastertools gave me a suprising information.
It can not find the sitemap created by infinite SEO!!!
As my blog is a blog of a multi site installation infinite SEO is using the path of the multi site... !!!
But webmastertools forces me to use my Domain of the blog, and its path.
The blog domain, I use, is already the main/primary Domain,... no doubt about that...
How can I fix this?