"The SharePoint item being crawled returned an error when attempting to download the item"

Hi everyone.

I"m having a issue that I haven't found any way to resolve that. I ran crawler and then viewed crawl log, I saw"The SharePoint item being crawled returned an error when attempting to download the item". I searched on Google and couldn't resolve.

I checked Search feature in my Site collection that is using Claim-Based Authentication but I cound't see  any result there. Also, I see the value ofSeachable item is 0 even though crawling worked well. I checked ULS and didn't see related to Search errors.

I'm using re-released June CU 2011 SharePoint Server 2010 patch.

Regards,