在一个虚拟环境(python 3.8)下，pip 安装完库后，运行sht.py时报错，内容如下，该如何修复？

[Rank1972]

(ctpbee_sht) F:\zhukun\ctpbee_sht>python sht.py

Traceback (most recent call last):
File "sht.py", line 9, in
from app.signin import SignInWidget
File "F:\zhukun\ctpbee_sht\Lib\site-packages\shiboken2\files.dir\shibokensupport_feature_.py", line 142, in import return original_import(name, *args, **kwargs)
File "F:\zhukun\ctpbee_sht\app\signin.py", line 14, in
from app.main import MainWindow
File "F:\zhukun\ctpbee_sht\Lib\site-packages\shiboken2\files.dir\shibokensupport_feature.py", line 142, in import return original_import(name, *args, **kwargs)
File "F:\zhukun\ctpbee_sht\app\main.py", line 16, in
from app.order import OrderWidget
File "F:\zhukun\ctpbee_sht\Lib\site-packages\shiboken2\files.dir\shibokensupport_feature.py", line 142, in _import return original_import(name, *args, **kwargs)
File "F:\zhukun\ctpbee_sht\app\order.py", line 25, in
"SSE": Exchange.SSE,
File "F:\python3.8\lib\enum.py", line 384, in getattr
raise AttributeError(name) from None
AttributeError: SSE