在coroweb.py的add_route函数定义里有

if not asyncio.iscoroutinefunction(fn) and not inspect.isgeneratorfunction(fn):    fn = asyncio.coroutine(fn)

python3.7版本以上运行会报错asyncio没有coroutine属性了，如果把这两行注释掉，运行app.py的时候可以打开http://127.0.0.1:9000/，但是页面会报错500 Internet Server Error

查看python报错是ERROR:aiohttp.server:Error handling request

Traceback (most recent call last):

  File "D:\PyCharm\awesome-python3-webapp\.venv\Lib\site-packages\aiohttp\web_protocol.py", line 452, in _handle_request

    resp = await request_handler(request)

           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  File "D:\PyCharm\awesome-python3-webapp\.venv\Lib\site-packages\aiohttp\web_app.py", line 543, in _handle

    resp = await handler(request)

           ^^^^^^^^^^^^^^^^^^^^^^

  File "D:\PyCharm\awesome-python3-webapp\.venv\Lib\site-packages\aiohttp\web_middlewares.py", line 114, in impl

    return await handler(request)

           ^^^^^^^^^^^^^^^^^^^^^^

  File "D:\PyCharm\awesome-python3-webapp\www\app.py", line 50, in logger

    return (await handler(request))

            ^^^^^^^^^^^^^^^^^^^^^^

  File "D:\PyCharm\awesome-python3-webapp\www\app.py", line 58, in response

    r = await handler(request)

        ^^^^^^^^^^^^^^^^^^^^^^

  File "D:\PyCharm\awesome-python3-webapp\.venv\Lib\site-packages\aiohttp\web_urldispatcher.py", line 205, in handler_wrapper

    assert isinstance(result, StreamResponse)

AssertionError

我在handlers.py已经把函数改成协程函数了

@get('/api/users')async def get_api_users():

请问Error handling request这个问题怎么解决呢？