老是提示2021-06-05 23:13:55 Futures_Binance 错误 Futures_OP 2: Invalid ContractType 2021-06-05 23:13:54 Futures_Binance 错误 Futures_OP 2: Invalid ContractType 2021-06-05 23:13:53 Futures_Binance 错误 Futures_OP 2: Invalid ContractType