Sorry Guys

      I was just a punk. I got it now.

I would clarify how I got it. I had two instances one was just Chintamani and another was Chintamani/Chintamani.

I had that AdventureWorks database on both of my instances but the test on later case.

So when I run the first BCP command it was using my first instance and executing that and similarly when I use second BCP command it was searching on my first instance and giving the error message. So I added the servername "-S Chintamani/Chintamani" on that command and now it is working.

Thank you guys for your time.