21:41:11 历史数据加载完成，数据量：60239
21:41:11 策略回测失败，触发异常：
Traceback (most recent call last):
File "G:\anaconda\anaconda3\envs\py3.12\Lib\site-packages\vnpy_ctabacktester\engine.py", line 195, in run_backtesting
engine.run_backtesting()
File "G:\anaconda\anaconda3\envs\py3.12\Lib\site-packages\vnpy_ctastrategy\backtesting.py", line 224, in run_backtesting
self.strategy.on_init()
File "G:\anaconda\anaconda3\envs\py3.12\Lib\site-packages\vnpy_ctastrategy\strategies\test_strategy.py", line 29, in on_init
self.write_log("策略初始化")
File "G:\anaconda\anaconda3\envs\py3.12\Lib\site-packages\vnpy_ctastrategy\template.py", line 266, in write_log
self.cta_engine.write_log(msg, self)
File "G:\anaconda\anaconda3\envs\py3.12\Lib\site-packages\vnpy_ctastrategy\backtesting.py", line 947, in write_log
msg = f"{self.datetime}\t{msg}"
^^^^^^^^^^^^^
AttributeError: 'BacktestingEngine' object has no attribute 'datetime'
