Unable to place limit order

Hi,
I am unable to place limit order, below are the params in passing and error response.
API URL : https://api.kite.trade/orders/regular
{product=MIS, price=566
, validity=DAY, transaction_type=SELL, quantity=xxx, tradingsymbol=RELCAPITAL, exchange=NSE, order_type=LIMIT}

Quantity and security params ommitted in post.

Response -
{"status": "error", "message": "Invalid `price`", "error_type": "OrderException"}

Please have a look and let me know if there is any issue