When I've validated robots.txt on webmaster tool, it give me error about the *, This is file contents:
User-agent: Mediapartners-Google*
Disallow:
User-agent: *
Disallow: /_private
User-agent: *
Disallow: /indexold.htm
So, what is the problem here?
Validator says also that sitemap is not specifed. How can I specify the sitemap here?
Note: I am not expert in editing robots.txt, so give me explained replies please.