Unknown trading symbol

Hi,

I have downloaded the instrument dump using the kiteconnect api

I wanted to trade in banknifty weekly option(12th August Expiry)

I found the following Put and call options for the same from the dump:

11095810 43343 BANKNIFTY2181236000PE BANKNIFTY

11098114 43352 BANKNIFTY2181236200CE BANKNIFTY

I am also able to find out the ltp of the given options and also download the historical data for the given options iusing kite api.

The only issue is that when I try to buy or sell the same instruments it gives me he following exception:

*** kiteconnect.exceptions.InputException: Unknown `tradingsymbol`.

The relevant code for buying is as shown:

def placeMarketOrder(symbol, buy_sell, quantity):
    # Place an intraday market order on NSE
    if buy_sell == "buy":
        t_type = kite.TRANSACTION_TYPE_BUY
    elif buy_sell == "sell":
        t_type = kite.TRANSACTION_TYPE_SELL
    kite.place_order(tradingsymbol=symbol,
                     exchange=kite.EXCHANGE_NSE,
                     transaction_type=t_type,
                     quantity=quantity,
                     order_type=kite.ORDER_TYPE_MARKET,
                     product=kite.PRODUCT_MIS,
                     variety=kite.VARIETY_REGULAR)


placeMarketOrder('BANKNIFTY2181236200CE', 'buy', 25)