Not able to place order thru Kite aPI

I am new to the Kite API tried to place an order the first time but was not able to place it. I am able to access my holding and other data thru kiteConnect.
I am using Orderparam given in the example only.
OrderParams orderParams = new OrderParams();
orderParams.quantity = 1;
orderParams.orderType = Constants.ORDER_TYPE_LIMIT;
orderParams.tradingsymbol = "ASHOKLEY";
orderParams.product = Constants.PRODUCT_CNC;
orderParams.exchange = Constants.EXCHANGE_NSE;
orderParams.transactionType = Constants.TRANSACTION_TYPE_BUY;
orderParams.validity = Constants.VALIDITY_DAY;
orderParams.price = 120.2;
orderParams.triggerPrice = 0.0;
orderParams.tag = "myTag";
order = kiteConnect.placeOrder(orderParams, Constants.VARIETY_REGULAR);