21:02:34 RQData数据接口初始化成功
21:02:38 ----------------------------------------
21:02:38 IF88.CFFEX-1m开始下载历史数据
21:02:41 数据下载失败，触发异常：
Traceback (most recent call last):
File "F:\Trade\VNPY\lib\site-packages\vnpy\app\cta_backtester\engine.py", line 381, in run_downloading
data = rqdata_client.query_history(req)
File "F:\Trade\VNPY\lib\site-packages\vnpy\trader\rqdata.py", line 136, in query_history
adjust_type="none"
File "F:\Trade\VNPY\lib\site-packages\rqdatac\decorators.py", line 131, in wrap
return func(*args, **kwargs)
File "F:\Trade\VNPY\lib\site-packages\rqdatac\services\get_price.py", line 131, in get_price
today_pf = get_today_minbar(order_book_ids, fields, duration, market)
File "F:\Trade\VNPY\lib\site-packages\rqdatac\services\get_price.py", line 483, in get_today_minbar
for obid, d in data:
TypeError: 'NoneType' object is not iterable
