Welcome to the openHAB Community @Kamal_Krishna 
First of all, we do here openHAB support and are not a general help desk.
Many people here will still gladly help you tho, but you need to provide better / more information about your setup.
You can read this topic here, which really helps new users asking the right questions 
Right now I have no clue what OS you are running (Windows, Linux, MacOS etc.)
So I can not provide the correct information and need to do the work 3x times for every os.
Please provide more information, thanks