Hi Marcus, Thanks a lot for the reply. The screen shot of the flow graph is present below.
http://pasteboard.co/HzDBxB6.png One more thing is that where in ubuntu is file_sink.cc or the C++ files of blocks present? I searched the whole computer for '.cc' and found no .cc gnu radio block file. I think I can easily change the C++ code to solve this problem. Please don't recommend adding a new block, because I have tried that 2 or 3 times and it just does not work. There are different errors everytime I try to add a new block, sometimes gnu radio just doesn't pick it up etc. Moreover there is also not much time left now, before my demo. Thanks once again for your time.
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