Not able to fetch any market data using api v2

Hi All, 

can anyone please resolve this issue of fetching marketdata.

I am using the pip version 2.0.4

code:
def getMarketData(self):

        access_token=client_id+':'+self.access_token

        print('access_token>>>>',access_token)

        data_type='symbolData'

        symbol = ['NSE:TATAMOTORS-EQ', 'NSE:ITC-EQ']

        def custom_message(ticks):

            print (ticks.response)

        ws.FyersSocket.websocket_data=custom_message

        fs=ws.FyersSocket(access_token,data_type,symbol)

        fs.subscribe ()

can anyone please help me , why this is not working

and the output is like this:

any help and answers would be helpful, if anyone else is facing the same issue please comment.

thank you.