问下这个是什么问题？

日期 平台 类型 价格 数量 信息 2018-08-01 20:09:19 错误 Error: bad argument #2 to ‘Exchange_GetOrder’ (interface {} expected, got null) at main (FILE:128) 2018-08-01 20:09:18 信息 账户信息，Balance: 1626.7494552648827 FrozenBalance: 304.008 Stocks: 2996.703498585609 FrozenStocks: 300 2018-08-01 20:09:17 FCoin 错误 Sell(0, 300): 400: {“status”:3033,“msg”:“market order is disabled for symbol ftusdt”} 2018-08-01 20:09:17 FCoin 错误 Buy(0, 300): 400: {“status”:3033,“msg”:“market order is disabled for symbol ftusdt”}