Error while placing braket order using API

 /** Place bracket order.*/
    public void placeBracketOrder(KiteConnect kiteConnect) {
        /** Bracket order:- following is example param for bracket order*
         * trailing_stoploss and stoploss_value are points and not tick or price
         */
    	try {
    	System.out.println("Inside Method");
        OrderParams orderParams = new OrderParams();
        orderParams.quantity = 1;
        orderParams.orderType = Constants.ORDER_TYPE_LIMIT;
        orderParams.price = 30.5;
        orderParams.transactionType = Constants.TRANSACTION_TYPE_BUY;
        orderParams.tradingsymbol = "ASHOKLEY";
        orderParams.trailingStoploss = 1.0;
        orderParams.stoploss = 2.0;
        orderParams.exchange = Constants.EXCHANGE_NSE;
        orderParams.validity = Constants.VALIDITY_DAY;
        orderParams.squareoff = 3.0;
        orderParams.product = Constants.PRODUCT_MIS;
         Order order10;
		try {
			order10 = kiteConnect.placeOrder(orderParams, Constants.VARIETY_BO);
			System.out.println(order10.orderId);
		} catch (KiteException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
         
    	}
    	catch(Exception e) {
    		e.printStackTrace();
    	}