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From a ranking perspective, it makes no difference whether your site is a .com, .info, etc. The problem with having a non-.com site is there will definitely be times when users try to access your site by visiting the .com version. If your URL is elitehomes.info sometimes people will visit the elitehomes.com site by mistake. It could cost you a client. The same idea holds for a hyphenated website. elite-realty.com will lose some visits due to users going to eliterealty.com. Additionally, users are most comfortable clicking through to a .com site, where other domains could experience lower acceptance. Regarding the error cleanup, if the errors are from your crawl report, then they exist on your site. Check the "referrer" field to find the page which contains the error. If it is a different report, try to locate the source or share some additional information about the tool you are using.