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Traceback (most recent call last):
File "C:\vnstudio\Lib\site-packages\vnpy\trader\ui\mainwindow.py", line 278, in open_widget
widget = widget_class(self.main_engine, self.event_engine)
File "C:\vnstudio\Lib\site-packages\vnpy\app\cta_strategy\ui\widget.py", line 37, in init
self.cta_engine.init_engine()
File "C:\vnstudio\Lib\site-packages\vnpy\app\cta_strategy\engine.py", line 109, in init_engine
self.load_strategy_data()
File "C:\vnstudio\Lib\site-packages\vnpy\app\cta_strategy\engine.py", line 794, in load_strategy_data
self.strategy_data = load_json(self.data_filename)
File "C:\vnstudio\Lib\site-packages\vnpy\trader\utility.py", line 99, in load_json
data = json.load(f)
File "c:\vnstudio\lib\json__init.py", line 296, in load
parse_constant=parse_constant, object_pairs_hook=object_pairs_hook, **kw)
File "c:\vnstudio\lib\json\
init__.py", line 348, in loads
return _default_decoder.decode(s)
File "c:\vnstudio\lib\json\decoder.py", line 337, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "c:\vnstudio\lib\json\decoder.py", line 355, in raw_decode
raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 31 column 17 (char 714)

这是什么问题??

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