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回测时遇到了问题,提示如下 #9

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@Praying

17:30:06 策略初始化完成
17:30:06 策略回测失败,触发异常:
Traceback (most recent call last):
File "D:\Anaconda\envs\vnpy\lib\site-packages\howtrader\app\cta_backtester\engine.py", line 161, in run_backtesting
engine.run_backtesting()
File "D:\Anaconda\envs\vnpy\lib\site-packages\howtrader\app\cta_strategy\backtesting.py", line 295, in run_backtesting
self.strategy.on_start()
File "D:\Anaconda\envs\vnpy\lib\site-packages\howtrader\app\cta_strategy\strategies\spot_simple_grid_strategy.py", line 64, in on_start
self.cta_engine.event_engine.register(EVENT_TIMER, self.process_timer_event)
AttributeError: 'BacktestingEngine' object has no attribute 'event_engine'

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