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UnicodeDecodeError when opening a project

See original GitHub issue

Problem Description

Use the following command to upgrade to 5.0.1, can not start.

conda install spyder=5.0.1

What steps reproduce the problem?

spyder5 0 1无法启动

Paste Traceback/Error Below (if applicable)

No QCoreApplication instance found. Application patches not applied. You have to call load_stylesheet function after instantiation of QApplication to take effect.
Traceback (most recent call last):
  File "C:\Users\Admin\Anaconda3\envs\python3.8.8\Scripts\spyder-script.py", line 10, in <module>
    sys.exit(main())
  File "C:\Users\Admin\Anaconda3\envs\python3.8.8\lib\site-packages\spyder\app\start.py", line 214, in main
    mainwindow.main(options, args)
  File "C:\Users\Admin\Anaconda3\envs\python3.8.8\lib\site-packages\spyder\app\mainwindow.py", line 2311, in main
    mainwindow = create_window(app, splash, options, args)
  File "C:\Users\Admin\Anaconda3\envs\python3.8.8\lib\site-packages\spyder\app\mainwindow.py", line 2172, in create_window
    main.post_visible_setup()
  File "C:\Users\Admin\Anaconda3\envs\python3.8.8\lib\site-packages\spyder\app\mainwindow.py", line 1300, in post_visible_setup
    self.projects.reopen_last_project()
  File "C:\Users\Admin\Anaconda3\envs\python3.8.8\lib\site-packages\spyder\plugins\projects\plugin.py", line 544, in reopen_last_project
    self.open_project(path=current_project_path,
  File "C:\Users\Admin\Anaconda3\envs\python3.8.8\lib\site-packages\spyder\plugins\projects\plugin.py", line 402, in open_project
    project_type_class = self._load_project_type_class(path)
  File "C:\Users\Admin\Anaconda3\envs\python3.8.8\lib\site-packages\spyder\plugins\projects\plugin.py", line 812, in _load_project_type_class
    config.read(fpath)
  File "C:\Users\Admin\Anaconda3\envs\python3.8.8\lib\configparser.py", line 697, in read
    self._read(fp, filename)
  File "C:\Users\Admin\Anaconda3\envs\python3.8.8\lib\configparser.py", line 1017, in _read
    for lineno, line in enumerate(fp, start=1):
UnicodeDecodeError: 'gbk' codec can't decode byte 0xac in position 233: illegal multibyte sequence