Can't instantiate abstract class ReverseProxyMatch without abstract methods

[minhoryang]

Environments: aioproxy [master]

aiohttp==0.22.4
chardet==2.3.0
mccabe==0.5.2
multidict==1.2.1

Traceback:

ERROR:aiohttp.web:Error handling request
Traceback (most recent call last):
  File "/Users/obrian/.anyenv/envs/pyenv/versions/3.5.1-swagger2proxy/lib/python3.5/site-packages/aiohttp/server.py", line 285, in start
    yield from self.handle_request(message, payload)
  File "/Users/obrian/.anyenv/envs/pyenv/versions/3.5.1-swagger2proxy/lib/python3.5/site-packages/aiohttp/web.py", line 75, in handle_request
    match_info = yield from self._router.resolve(request)
  File "/Users/obrian/projects/Swagger2Proxy/aioproxy.py", line 216, in resolve
    return ReverseProxyMatch(self.resolver)
TypeError: Can't instantiate abstract class ReverseProxyMatch with abstract methods expect_handler, get_info, http_exception