autopilot music_app UInputError

phablet@ubuntu-phablet:~$ autopilot run music_app
Loading tests from: /usr/lib/python2.7/dist-packages

Tests running...
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ERROR: music_app.tests.test_music.TestMainWindow.test_reads_music_from_home(with touch)
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_StringException: Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/music_app/tests/test_music.py", line 31, in setUp
    super(TestMainWindow, self).setUp()
  File "/usr/lib/python2.7/dist-packages/music_app/tests/__init__.py", line 35, in setUp
    self.pointing_device = Pointer(self.input_device_class.create())
  File "/usr/lib/python2.7/dist-packages/autopilot/input/__init__.py", line 354, in create
    return _pick_backend(backends, preferred_backend)
  File "/usr/lib/python2.7/dist-packages/autopilot/utilities.py", line 56, in _pick_backend
    "Unable to instantiate any backends\n%s" % '\n'.join(failure_reasons))
RuntimeError: Unable to instantiate any backends
UInput: UInputError('"/dev/uinput" cannot be opened for writing',)

======================================================================
ERROR: music_app.tests.test_music.TestMainWindow.test_play(with touch)
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_StringException: Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/music_app/tests/test_music.py", line 31, in setUp
    super(TestMainWindow, self).setUp()
  File "/usr/lib/python2.7/dist-packages/music_app/tests/__init__.py", line 35, in setUp
    self.pointing_device = Pointer(self.input_device_class.create())
  File "/usr/lib/python2.7/dist-packages/autopilot/input/__init__.py", line 354, in create
    return _pick_backend(backends, preferred_backend)
  File "/usr/lib/python2.7/dist-packages/autopilot/utilities.py", line 56, in _pick_backend
    "Unable to instantiate any backends\n%s" % '\n'.join(failure_reasons))
RuntimeError: Unable to instantiate any backends
UInput: UInputError('"/dev/uinput" cannot be opened for writing',)

======================================================================
ERROR: music_app.tests.test_music.TestMainWindow.test_pause(with touch)
----------------------------------------------------------------------
_StringException: Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/music_app/tests/test_music.py", line 31, in setUp
    super(TestMainWindow, self).setUp()
  File "/usr/lib/python2.7/dist-packages/music_app/tests/__init__.py", line 35, in setUp
    self.pointing_device = Pointer(self.input_device_class.create())
  File "/usr/lib/python2.7/dist-packages/autopilot/input/__init__.py", line 354, in create
    return _pick_backend(backends, preferred_backend)
  File "/usr/lib/python2.7/dist-packages/autopilot/utilities.py", line 56, in _pick_backend
    "Unable to instantiate any backends\n%s" % '\n'.join(failure_reasons))
RuntimeError: Unable to instantiate any backends
UInput: UInputError('"/dev/uinput" cannot be opened for writing',)


Ran 3 tests in 0.192s
FAILED (failures=3)
phablet@ubuntu-phablet:~$ ls
Documents  Downloads  Music  Pictures  Videos
phablet@ubuntu-phablet:~$ autopilot run music_app > music_app_errors.txt
phablet@ubuntu-phablet:~$ sudo apt-get install scp
[sudo] password for phablet:
Sorry, try again.
[sudo] password for phablet:
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package scp
phablet@ubuntu-phablet:~$ less music_app_errors.txt
Loading tests from: /usr/lib/python2.7/dist-packages

Tests running...
======================================================================
ERROR: music_app.tests.test_music.TestMainWindow.test_reads_music_from_home(with touch)
----------------------------------------------------------------------
_StringException: Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/music_app/tests/test_music.py", line 31, in setUp
    super(TestMainWindow, self).setUp()
  File "/usr/lib/python2.7/dist-packages/music_app/tests/__init__.py", line 35, in setUp
    self.pointing_device = Pointer(self.input_device_class.create())
  File "/usr/lib/python2.7/dist-packages/autopilot/input/__init__.py", line 354, in create
    return _pick_backend(backends, preferred_backend)
  File "/usr/lib/python2.7/dist-packages/autopilot/utilities.py", line 56, in _pick_backend
    "Unable to instantiate any backends\n%s" % '\n'.join(failure_reasons))
RuntimeError: Unable to instantiate any backends
UInput: UInputError('"/dev/uinput" cannot be opened for writing',)