前几天我读取火币数据都正常，今天一直提示错误，哪怕我就改成最简单的如下：

def main():
records = exchange.GetRecords(PERIOD_H1)
Log("第一根k线数据为，Time:", records[0]["Time"], "Open:", records[0]["Open"], "High:", records[0]["High"])
Log("第二根k线数据为，Time:", records[1]["Time"], "Close:", records[1]["Close"])
Log("当前K线（最新）", records[-1], "上一根K线", records[-2])

还是出现错误
GetRecords: type assertion to []interface{} failed

我用的是火币的自定义交易对，BTC_USD