Traceback (most recent call last):


 "D:\Anaconda\envs\spacy\lib\socketserver.py", line 320, in _handle_request_noblock

self.process_request(request, client_address)


 "D:\Anaconda\envs\spacy\lib\socketserver.py", line 351, in process_request

self.finish_request(request, client_address)


 "D:\Anaconda\envs\spacy\lib\socketserver.py", line 364, in finish_request

self.RequestHandlerClass(request, client_address, self)


 "D:\Anaconda\envs\spacy\lib\socketserver.py", line 724, in __init__

self.handle()


 "D:\Anaconda\envs\spacy\lib\wsgiref\simple_server.py", line 133, in handle

handler.run(self.server.get_app())


 "D:\Anaconda\envs\spacy\lib\wsgiref\handlers.py", line 144, in run

self.close()


 "D:\Anaconda\envs\spacy\lib\wsgiref\simple_server.py", line 35, in close

self.status.split(' ',1)[0], self.bytes_sent
AttributeError: 'NoneType' object has no attribute 'split'

Traceback (most recent call last):


 "...\AppData\Local\Programs\Python\Python36-32\lib\runpy.py", line 193, in _run_module_as_main

"__main__", mod_spec)


 "...\AppData\Local\Programs\Python\Python36-32\lib\runpy.py", line 85, in _run_code

exec(code, run_globals)


 "...\main.py", line 24, in <module>

main().main_loop()


 "...\AppData\Local\Programs\Python\Python36-32\lib\site-packages\toga_winforms\app.py", line 49, in main_loop

self._startup()


 "...\AppData\Local\Programs\Python\Python36-32\lib\site-packages\toga_winforms\app.py", line 41, in _startup

self.startup()


 "...\AppData\Local\Programs\Python\Python36-32\lib\site-packages\toga\interface\app.py", line 144, in startup

self.main_window.content = self._startup_method(self)


 "...\main.py", line 9, in build

box = toga.Box()


 "...\AppData\Local\Programs\Python\Python36-32\lib\site-packages\toga_winforms\widgets\box.py", line 10, in __init__

super().__init__(id=id, style=style, children=children)


 "...\AppData\Local\Programs\Python\Python36-32\lib\site-packages\toga\interface\widgets\box.py", line 21, in __init__

super().__init__(id=id, style=style, children=children)


 "...\AppData\Local\Programs\Python\Python36-32\lib\site-packages\toga\interface\widgets\base.py", line 144, in __init__

self.style = CSS()


 "...\AppData\Local\Programs\Python\Python36-32\lib\site-packages\toga\interface\widgets\base.py", line 170, in style

self._style = value.bind(self)
AttributeError: 'CSS' object has no attribute 'bind'
