Hello,  I'm having this error on the SearchCrawler's schedule log

SearchCrawler SearchCrawler - Start Indexing of Site http://www.xyz.com

0 http://www.xyz.com/

SearchCrawler - An error occurred while downloading the previous URI: The server committed a protocol violation. Section=ResponseHeader Detail=CR must be followed by LFSearchCrawler - Index Exists

SearchCrawler - Index Copied

Any ideas why this error coming in search crawler.