No valid order entries found in the JSON payload

When clicking on Buy/Sell button showing error
{
"error_type": "InvalidDataError",
"message": "No valid order entries found in the JSON payload",
"status": "error"
}

My code is

<kite-button href="#" data-kite="ypj2ir5mfro92gah"
            data-exchange="MCX"
            data-tradingsymbol="GOLD5DECFUT"
            data-transaction_type="BUY"
            data-quantity="1"
            data-order_type="MARKET">Buy</kite-button>

Can you please tell me whats wrong, i have followed the documentation on your site.
Is there any list of trading symbols and their related exchange codes