10:59:42 初始化CTA回测引擎
10:59:42 策略文件strategies.demo_strategy加载失败，触发异常：
Traceback (most recent call last):
File "C:\D\sofftwareInstall\vnpython-statio\lib\site-packages\vnpy_ctabacktester\engine.py", line 114, in load_strategy_class_from_module
module: ModuleType = importlib.import_module(module_name)
File "C:\D\sofftwareInstall\vnpython-statio\lib\importlib__init__.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 883, in exec_module
File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
File "C:\Users\mokaiyang\strategies\demo_strategy.py", line 1, in <module>
from vnpy.app.cta_strategy import (
ModuleNotFoundError: No module named 'vnpy.app'
