Unable to GET data via websocket

Getting the following RuntimeWarning while subscribing to the FyresSocket and no data is received 
 

Access_token = ENV_DATA.get('CLIENT_ID')+":"+access_token
data_type = "symbolData"
symbol=["MCX:CRUDEOIL21SEPFUT", "NSE:INFY-EQ"]

def custom_message(self):
	print(self)    

ws.FyersSocket.websocket_data = custom_message

fyersSocket = ws.FyersSocket(access_token=Access_token, data_type=data_type,symbol=symbol)

fyers-apiv2 version 2.0.4

any help is appreciated 

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