导入数据时报日期格式错误,第一列日期格式如‘2021-03-30 09:18:00’,请帮忙看下什么原因
`Traceback (most recent call last):
File "c:\vnstudio\lib\site-packages\vnpy\app\data_manager\ui\widget.py", line 234, in import_data
datetime_format
File "c:\vnstudio\lib\site-packages\vnpy\app\data_manager\engine.py", line 58, in import_data_from_csv
dt = datetime.strptime(item[datetime_head], datetime_format)
KeyError: 'datetime'
`