无法加载策略，点击开始回测触发异常
Traceback (most recent call last):
File "d:\vnstudio\lib\site-packages\vnpy_ctabacktester\ui\widget.py", line 350, in start_backtesting
old_setting = self.settings[class_name]
KeyError: ''
无法加载策略，点击开始回测触发异常
Traceback (most recent call last):
File "d:\vnstudio\lib\site-packages\vnpy_ctabacktester\ui\widget.py", line 350, in start_backtesting
old_setting = self.settings[class_name]
KeyError: ''
可以pip install --upgrade vnpy_ctabacktester试试
