# Mopidy cannot start with AttributeError: has no attribute "ping" \[Mac OS X\]

**URL:** <https://discourse.mopidy.com/t/mopidy-cannot-start-with-attributeerror-has-no-attribute-ping-mac-os-x/1185>\
**Category:** Misc\
**Created:** [April 3, 2016, 10:35am UTC](https://discourse.mopidy.com/t/mopidy-cannot-start-with-attributeerror-has-no-attribute-ping-mac-os-x/1185 "2016-04-03T10:35:11Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![roosnic1](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.mopidy.com/roosnic1/32/374_2.png) [@roosnic1](https://discourse.mopidy.com/u/roosnic1)\
**Post date:** [April 3, 2016, 10:35am UTC](https://discourse.mopidy.com/t/mopidy-cannot-start-with-attributeerror-has-no-attribute-ping-mac-os-x/1185/1 "2016-04-03T10:35:11Z")

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I installed Mopidy 2.0.0 according to the installation guide with Homebrew on my Mac OS X 10.11.4 (EL Capitan). The installation was successful and I had to relink one brew formula with brew link afterwards. But when I start Mopidy from the terminal with the command **mopidy** the console outputs the following error:

```auto
$ mopidy
INFO Starting Mopidy 2.0.0
INFO Loading config from builtin defaults
...
INFO Starting Mopidy backends: StreamBackend, M3UBackend, FileBackend
ERROR Uncaught exception
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/site-packages/mopidy/commands.py", line 307, in run
    backends = self.start_backends(config, backend_classes, audio)
  File "/usr/local/lib/python2.7/site-packages/mopidy/commands.py", line 391, in start_backends
    backend.ping().get()
  File "/usr/local/lib/python2.7/site-packages/pykka/proxy.py", line 167, in __getattr__
    raise AttributeError('%s has no attribute "%s"' % (self, name))
AttributeError: <ActorProxy for StreamBackend (urn:uuid:be36db22-6b23-4a77-b130-139b906706e0), attr_path=()> has no attribute "ping"
INFO Stopping Mopidy frontends
INFO Stopping Mopidy core
INFO Stopping Mopidy backends
INFO Stopping Mopidy audio
INFO Audio output set to "autoaudiosink"
INFO Stopping Mopidy mixer

```

I already tried the method mentioned in this similar [topic](https://discourse.mopidy.com/t/mopidy-cannot-start-with-attributeerror-has-no-attribute-ping/1038/2) with no success. I also tried uninstalling and reinstalling Mopidy with no success.

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**Author:** ![jcass77](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.mopidy.com/jcass77/32/721_2.png) [@jcass77](https://discourse.mopidy.com/u/jcass77)\
**Post date:** [April 3, 2016, 7:42pm UTC](https://discourse.mopidy.com/t/mopidy-cannot-start-with-attributeerror-has-no-attribute-ping-mac-os-x/1185/2 "2016-04-03T19:42:20Z")

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It might be worth checking if you do not also have Mopidy installed via pip.

In addition to [https://github.com/mopidy/homebrew-mopidy/issues/3](https://github.com/mopidy/homebrew-mopidy/issues/3), I also seem to recall having to execute `pip uninstall mopidy` multiple times until pip did not find anything to uninstall. But this was a while ago so I’m foggy on the details.

In fact I think I ended up uninstalling with brew and re-installed Mopidy via pip instead to get it working. But the brew install is required as a starting point to get all of the gst dependencies installed with the correct options.

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**Author:** ![roosnic1](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.mopidy.com/roosnic1/32/374_2.png) [@roosnic1](https://discourse.mopidy.com/u/roosnic1)\
**Post date:** [April 4, 2016, 7:41am UTC](https://discourse.mopidy.com/t/mopidy-cannot-start-with-attributeerror-has-no-attribute-ping-mac-os-x/1185/3 "2016-04-04T07:41:14Z")

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Thanks a lot for your help. I run `pip uninstall mopidy` multiple times and then run `brew uninstall mopidy`. Afterwards I installed Mopidy with `pip install mopidy` successfully.