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E.g.:
```
$ .tox/flake8/bin/flake8 mobileweb
Traceback (most recent call last):
File ".tox/flake8/bin/flake8", line 9, in <module>
load_entry_point('flake8', 'console_scripts', 'flake8')()
File "/Users/marca/dev/git-repos/flake8/src/flake8/main/cli.py", line 16, in main
app.run(argv)
File "/Users/marca/dev/git-repos/flake8/src/flake8/main/application.py", line 316, in run
self._run(argv)
File "/Users/marca/dev/git-repos/flake8/src/flake8/main/application.py", line 299, in _run
self.initialize(argv)
File "/Users/marca/dev/git-repos/flake8/src/flake8/main/application.py", line 289, in initialize
self.find_plugins()
File "/Users/marca/dev/git-repos/flake8/src/flake8/main/application.py", line 143, in find_plugins
self.check_plugins.load_plugins()
File "/Users/marca/dev/git-repos/flake8/src/flake8/plugins/manager.py", line 375, in load_plugins
plugins = list(self.manager.map(load_plugin))
File "/Users/marca/dev/git-repos/flake8/src/flake8/plugins/manager.py", line 267, in map
yield func(self.plugins[name], *args, **kwargs)
File "/Users/marca/dev/git-repos/flake8/src/flake8/plugins/manager.py", line 373, in load_plugin
return plugin.load_plugin()
File "/Users/marca/dev/git-repos/flake8/src/flake8/plugins/manager.py", line 173, in load_plugin
raise failed_to_load
flake8.exceptions.FailedToLoadPlugin: Flake8 failed to load plugin "P999" due to Plugin <module 'teamcity.flake8_plugin' from '/Users/marca/dev/git-repos/teamcity-messages/teamcity/flake8_plugin.pyc'> is not a callable. It might be written for an older version of flake8 and might not work with this version.
```
This is nicer than the previous behavior of raising an obscure `PicklingError` and then hanging.
```
$ .tox/flake8/bin/flake8 mobileweb
Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/multiprocessing/queues.py", line 268, in _feed
send(obj)
PicklingError: Can't pickle <type 'module'>: attribute lookup __builtin__.module failed
```
See #164
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Previously, pycodestyle never introspected the argument names for
classes except to require that ``tree`` be an argument it could pass.
For Flake8 3.0, we lifted that restriction, but old plugins seem to
have cargo-culted their __init__ signature to be
def __init__(self, tree, builtins=None):
For some yet unknown reason. This was causing an AttributeError. By
updating flake8.utils.parameters_for to return a dictionary that
indicates whether the parameter is required or not, we can side-step
this by simply ignoring the parameter if it has a default value and
we cannot provide it.
Closes #151
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