Hi Lukesh,
I was experiencing the same thing with SOLMAN 7.1 and NWBC 6.0 until I came across this thread NWBC 3.0 No content available. Please contact Admin and the helpful answer from Tim Stadler at the bottom.
Basically in the personalize options of NWBC untick "Use SAP Menu Instead of User Menu" that worked for me.
Cheers
Craig