Googlebot can't access your site

Hello Everyone…

Last week i was seen my webmaster for my website, google webmaster tool show me this Error: Googlebot can’t access your site”
“Over the last 24 hours, Googlebot encountered 105 errors while attempting to connect to your site. Your site’s overall connection failure rate is 2.9%.”

Please tell me How to Remove this Eroor.

Your robots.txt file appears to disallow Google to index your home page (default.html). Not sure if that has anything to do with it. Your index.html file fires a spam alert on my computer. Hmmmm …

Then What i can do for remove this Error.

If that is what’s causing the problem, you can remove that line from the robots file.

Which Line remove that from the robots file ?

[FONT=Verdana]This one: