Setup issue

its benn a week since my last setup, now i cannot setup for nest, netatmo, arlo and homekit components, been trying to setup new ha but it still doesnt work and everytime theés no.conf file, it seems is not conectting, for arlo nest and netatmo also donesnt have .conf file

Error during setup of component arlo

Traceback (most recent call last):
  File "/srv/homeassistant/lib/python3.5/site-packages/homeassistant/setup.py", line 145, in _async_setup_component
    component.setup, hass, processed_config)
  File "/usr/lib/python3.5/asyncio/futures.py", line 380, in __iter__
    yield self  # This tells Task to wait for completion.
  File "/usr/lib/python3.5/asyncio/tasks.py", line 304, in _wakeup
    future.result()
  File "/usr/lib/python3.5/asyncio/futures.py", line 293, in result
    raise self._exception
  File "/usr/lib/python3.5/concurrent/futures/thread.py", line 55, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/srv/homeassistant/lib/python3.5/site-packages/homeassistant/components/arlo.py", line 38, in setup
    conf = config[DOMAIN]
KeyError: 'arlo'

any advice ?