Chandra,
Your issue is really strange! Are you in the AWS cloud or is this your client instance? Which version of HANA revision are you running in the backend and frontend on? Both rev.#'s should match backend and front-end.
Few months ago, I experienced a similar weird issue in my AWS cloud when I was in rev. 52. I full stopped the HANA server and started it and reassigned the grants and it fixed the problem. If you are in the cloud try this assuming my solution may work for you.
Good luck!
Rama