while running test getting for some users NL-Network-01 java.net.UnknownHostException: error, same test scripts i have executed few more days back but at that time i didn't get this issue now getting this issues can you please suggest me why coming these errors and how to fix it?
Those errors are due to name resolution error. Basically NeoLoad was not able to resolve the name of your server. You maybe had a DNS issue at that time that's why it worked fine the first time.
You should check with your network team.