Plugin to Fix Crawl Errors in Google Webmaster Tools

Googlebots is a pretty much mysterious thing when it comes to report crawl errors. Worldwide thousands of people wonder why their websites produce thousands of urls which – according google – dont exist.
So I’m looking for a plugin which does exactly that, correcting things in such a way so that googlebots won’t report any broken urls.
Thanks for any link at http://ww.wp.xz.cn/extend/plugins/