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Error while subscribing for live data feed in websocket in javascript

NodeJS SDK
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    Hi @admin and everyone,
    I am trying to subscribe to a token using webscoket V2 in javascript. After making a websocket connection I am running following code inside fetchData function:

    let req = '{"correlationID":"' + "abcde12345" + '","action":"'+ 1 + '","params":"' + '{"mode":"'+ 1 + '","tokenList":"' + '[{"exchangeType":"' + 1 + '","tokens":"' + '["3045"]'+'"}]}}';

    ws.send(req);

    I am getting following error:
    Error while processing message

    Is there anything wrong in the request string?
    Please help.

    Thanks and regards,
    Prashant

    1