Google Adsense/robots.txt issue

I have a blog that has Google Adsense ads.
Yesterday I checked my Google Adsense acct and it said it hasn’t been crawling my site for ads for about a week due to the presence of a robots.txt file in my code. The problem is, I don’t have a robots.txt file in any of my pages.

It then said whether the code is or is not present, add the following two-line code

User-agent: Mediapartners-Google
Disallow:

to the robots.txt file (or create one if I don’t have it) and then upload it to the root directory at my server. I did just that: I created a blank txt file and added the two-line code and then sent it to my server. But this still perplexes me.

My question is: doesn’t the presence of the word, “Disallow:” mean the Google crawlers won’t be able to crawl my site? Of, is it because the word, “Disallow:” is left empty that they will?

Thanks.

Because you have no value for the disallow it is allowed.
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# Allows all Robots

User-agent: *
Disallow:

[/FONT]So in your case you are allowing the bot you listed.

if you have no robots.txt it should be fine. But you can create one like xhtmlcoder showed.