错误信息返回格式
{ "id": "id generate by client", "status": "error", "err-code": "err-code", "err-msg": "err-message", "ts": 1487152091345 }
注："ts" 为错误信息生成的时间戳，单位：毫秒
| err-msg | 描述 |
|---|---|
| invalid topic market.invalidsymbol.kline.1min | 错误的 symbol |
| invalid topic market.btccny.kline.3min | 错误的 topic |
| unsub with not subbed topic market.btccny.trade.detail | 取消订阅一个尚未订阅的 topic |
| unsub with not subbed topic not-exists-topic | 取消订阅一个不存在的 topic |
| invalid topic market.invalidsymbol.trade.detail | 错误的 symbol |