Problem: can't start the app

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When I ran this example, I reported the following error

2019/09/19 10:15:50 [Register] OK <Post: /posts /news?p=1>
2019/09/19 10:15:50 [Register] OK <Post: /posts?page={page} /news?p={page}>
2019/09/19 10:15:50 [Register] OK <Page: /posts /news?p=1>
2019/09/19 10:15:50 [Register] OK <Page: /posts?page={page} /news?p={page}>
2019/09/19 10:15:50 [Serving ] OK http://0.0.0.0:5001
2019/09/19 10:15:50 [Serving ] FAIL Windows error 1
2019/09/19 10:15:50 [Serving ] FAIL Traceback (most recent call last):
File "D:\python\lib\site-packages\toapi\api.py", line 50, in run
self.app.run(host, port, **options)
File "D:\python\lib\site-packages\flask\app.py", line 938, in run
cli.show_server_banner(self.env, self.debug, self.name, False)
File "D:\python\lib\site-packages\flask\cli.py", line 629, in show_server_banner
click.echo(message)
File "D:\python\lib\site-packages\click\utils.py", line 260, in echo
file.write(message)
File "D:\python\lib\site-packages\click_winconsole.py", line 180, in write
return self._text_stream.write(x)
File "D:\python\lib\site-packages\click_winconsole.py", line 164, in write
raise OSError(self._get_error_message(GetLastError()))
OSError: Windows error 1

toapi, version 2.1.0
Flask 1.0.2
Python 3.6.0