Skybeacon Sensor

Hi,
I’m new to home-assistant and I tried to configure 4 skybeacons as temp/hum sensors with hass, but at startup I get following errors:

INFO:homeassistant.components.sensor.skybeacon:Connecting to bathroom
Exception in thread livingroom:
Traceback (most recent call last):
  File "/srv/homeassistant/lib/python3.4/site-packages/homeassistant/components/sensor/skybeacon.py", line 150, in run
    adapter.start(reset_on_start=False)
  File "/home/homeassistant/.homeassistant/deps/pygatt/backends/gatttool/gatttool.py", line 222, in start
    self._con = pexpect.spawn(gatttool_cmd, logfile=self._gatttool_logfile)
NameError: name 'pexpect' is not defined

I searched the internet but found no solution for this problem.
Anybody can help me?

Greetings,

Martin

You need to pip3 install pexpect I believe.