Hi Debdatta,
I am fine thanks. I hope you are fine as well.
The message 401 not authorized means that the user id you are using to call the webservice lacks the proper authorizations.
I am not sure but maybe you can check this with transaction SU53 in the SAP backend after you have had this error message.
If you start transaction SU53 it will give you the authorization checks of your user, but in the main screen you can change the user to the user which gave the error by clicking 
fill in the user name and it should show you which authorizations are missing.
Ask basis team to add the missing authorizations for this user.