How can I ask google not to crawl some pages?

I've submitted one sitemap.xml and just few minutes after I've noticed
those pages were wrong and Google can not crawl them...
I've resubmitted new one immediately but Google still is crawling those
none existing pages and I'm receiving errors every time it crawls.

Is there any way I ask Google (or any syntax in sitemap.xml) not to
crawl those wrong pages.

Please advise, Faramarz