Hi Prabhakar
it appears you are trying to test your application with selenium, my suggestion is to first try the tutorial here on your local application: https://docs.mendix.com/howto6/testing-mendix-applications-using-selenium-ide, then make sure you have added the MendixNameLocatorBuilder.js file as a selenium ide extension as per installation instructions, compare the step results of you different runs. The MendixNameLocator was last updated 2 years ago and may not support your current platform version and may need manual adjustments. Good luck.