Bybit order error

Hi, I am getting this error below when I try to create an order on Bybit. I am sure the parameters should be correct. Also, I have some other private calls before that in my code which work and fetch data just fine.

• OS: Kubuntu 20.10 (beta)
• Programming language version: Python 3.7.5
• CCXT version: 1.33.53

print ((await Client.privatePostOrderCreate({"order_type": "Limit", "symbol": BaseInstrument, "side": "Buy", "qty": BaseQuantity, "time_in_force": "PostOnly", "price": self.BuyPostPrices.pop(self.BuyPostPrices.index(max(self.BuyPostPrices)))})))

raise ExchangeError(feedback)  # unknown message
ccxt.base.errors.ExchangeError: bybit {"ret_code":10004,"ret_msg":"error sign! origin_string[api_key=\u0026order_type=Limit\u0026price=11288.0\u0026qty=1\u0026recv_window=5000\u0026side=Buy\u0026symbol=BTCUSD\u0026time_in_force=PostOnly\u0026timestamp=1598386304084]","ext_code":"","ext_info":"","result":null,"time_now":"1598386304.170475"}