VN Trade Pro中，点击回测按钮，就报这个错：
Traceback (most recent call last):
File "c:\vnstudio\lib\site-packages\vnpy\trader\ui\mainwindow.py", line 281, in open_widget
widget = widget_class(self.main_engine, self.event_engine)
File "c:\vnstudio\lib\site-packages\vnpy\app\cta_backtester\ui\widget.py", line 51, in init
self.init_strategy_settings()
File "c:\vnstudio\lib\site-packages\vnpy\app\cta_backtester\ui\widget.py", line 59, in init_strategy_settings
setting = self.backtester_engine.get_default_setting(class_name)
File "c:\vnstudio\lib\site-packages\vnpy\app\cta_backtester\engine.py", line 246, in get_default_setting
return strategy_class.get_class_parameters()
File "c:\vnstudio\lib\site-packages\vnpy\app\cta_strategy\template.py", line 60, in get_class_parameters
class_parameters[name] = getattr(cls, name)
AttributeError: type object 'AtrRsiStrategy' has no attribute 'boll_de'
请求帮助。谢谢！

请问：如果想生成X分钟的K线，写了一个on_x_bar函数，可是怎么能print()出所生成的K线，能看到每根K线的时间确实是自己想要合成的分钟？谢谢！

刚买的腾讯云。
vnpy2.1.1在腾讯云server2012R2 64位数据中心，安装顺利，未提示错误，但一运行就报错。看不懂这是什么意思。麻烦大家帮忙看看需要如何解决？

Traceback (most recent call last):
File "D:\vnstudio\lib\site-packages\vnstation\cli.py", line 90, in run_trader
module = importlib.import_module(d["module"])
File "D:\vnstudio\lib\importlib__init.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
File "<frozen importlib._bootstrap>", line 983, in _find_and_load
File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 728, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "D:\vnstudio\lib\site-packages\vnpy\app\cta_strategy\init.py", line 9, in <module>
from .engine import CtaEngine
File "D:\vnstudio\lib\site-packages\vnpy\app\cta_strategy\engine.py", line 39, in <module>
from vnpy.trader.database import database_manager
File "D:\vnstudio\lib\site-packages\vnpy\trader\database\init.py", line 12, in <module>
database_manager: "BaseDatabaseManager" = init(settings=settings)
File "D:\vnstudio\lib\site-packages\vnpy\trader\database\initialize.py", line 6, in init
driver = Driver(settings["driver"])
File "D:\vnstudio\lib\enum.py", line 309, in call
return cls.new(cls, value)
File "D:\vnstudio\lib\enum.py", line 543, in new
return cls.missing(value)
File "D:\vnstudio\lib\enum.py", line 556, in missing
raise ValueError("%r is not a valid %s" % (value, cls.name__))
ValueError: 'Sqlite' is not a valid Driver

MongoDB以前也没用过，运行张国平老师的“从IB接口获取历史数据”的代码，把“Sqlite”修改成MongoDB，其它地方未改。再运行出现上面的错误提示。
点关闭后，再点VN Trader Pro，提示已经在运行中。

英文水平太差，表示基本看不懂。请各位帮忙看是否需要重装VNStudio