Thankyou Sir for your response. Sorry for replying late Sir. I didnot receive your mail so i had to go to the website and check it.
I tried to add the WX GUI FFT Sink to my audio tone signal flow graph.But after the execution the same error persists. Then I changed the WX GUI Sink to QT GUI Sink, it was working well and the graph can also be seen. So as you have mentioned, it is a problem with the WX components. Below attached is the .grc file for my project. Another doubt Sir is that,are all the WX components replacable by the QT components. Thankyou
QAM64.grc
Description: Binary data
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