Question : removing not found URL from Google webmaster

Hi, I uploaded a new sitemap.xml a few weeks ago to my webmaster account. unfortunatley Google webmaster web crawl there are three URLs no found, and yet those three URLs/pages are not actually on the hosting account or in the sitemaps...when/how do I remove them?

Answer : removing not found URL from Google webmaster

Reset your sitemap.xml, and upload it to the respective location.
Go to https://www.google.com/webmasters/tools/
On the dashboard -> In Left hand side menu you will find "Sitemaps"
Clicking on it will show you present sitemap.xml.
Click on checkbox to select it and click on button "Resubmit Selected".

Google will read it again.