Running error reports with exchange.IO

The error message: TypeError: Cannot convert ETC_USDT to int

The error code is:exchange.IO("currency", name + _USDT); // Set the type of digital currency to trade

The platform: OKEX

I checked and found that the OKEX futures are not supported.exchange.ioIf you don't support retesting, how do you test?

Please help me, thank you.