tangor - 12:20 am on Jan 21, 2012 (gmt 0)
Why are you spending time in your ERROR log? Those entries have already been handled by the server and do not constitute significant bandwidth traffic on your site. Look at your active server logs to see if you can find any kind of pattern to the entries in the error log...which might provide info regarding scrapers, mal-links, etc. Better place to spend your time. The error.log is links already dealt with.