使用BollChannelStategy时候报错如下
10:07:59 Traceback (most recent call last):
File "C:\vnstudio\Project\vnpy2.1.2\vnpy\app\cta_strategy\backtesting.py", line 288, in run_backtesting
self.callback(data)
File "C:\vnstudio\Project\vnpy2.1.2\vnpy\app\cta_strategy\strategies\boll_channel_strategy.py", line 76, in on_bar
self.bg.update_bar(bar)
File "C:\vnstudio\Project\vnpy2.1.2\vnpy\trader\utility.py", line 249, in update_bar
dt = bar.datetime.replace(second=0, microsecond=0)
TypeError: replace() takes no keyword arguments
