Running example "invoke app.run" fails with "Type Error:Tasks must have an initial Context argument"

Hey,

Sounds like a great project. However I’m trying to run it on my local machine (OSX El-Capitan, Python 2.7.10) and I receive an error:

>> invoke app.run
2016-11-18 12:15:27,067 [WARNING] [tasks.app.db] Alembic cannot be imported, so some app.db.* tasks won't be available!
Traceback (most recent call last):
  File "/usr/local/bin/invoke", line 11, in <module>
    sys.exit(program.run())
  File "/usr/local/lib/python2.7/site-packages/invoke/program.py", line 269, in run
    self._parse(argv)
  File "/usr/local/lib/python2.7/site-packages/invoke/program.py", line 325, in _parse
    self.load_collection()
  File "/usr/local/lib/python2.7/site-packages/invoke/program.py", line 473, in load_collection
    coll = loader.load(coll_name) if coll_name else loader.load()
  File "/usr/local/lib/python2.7/site-packages/invoke/loader.py", line 53, in load
    module = imp.load_module(name, fd, path, desc)
  File "/Users/ilaif/Desktop/flask-restplus-server-example/tasks/__init__.py", line 61, in <module>
    from . import app
  File "/Users/ilaif/Desktop/flask-restplus-server-example/tasks/app/__init__.py", line 8, in <module>
    from . import dependencies, env, db, run, users
  File "/Users/ilaif/Desktop/flask-restplus-server-example/tasks/app/db.py", line 272, in <module>
    def init_development_data(context, upgrade_db=True, skip_on_failure=False):
  File "/Users/ilaif/Desktop/flask-restplus-server-example/tasks/app/_utils.py", line 58, in app_context_task
    return Task(wrapper, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/invoke/tasks.py", line 58, in __init__
    self.positional = self.fill_implicit_positionals(positional)
  File "/usr/local/lib/python2.7/site-packages/invoke/tasks.py", line 149, in fill_implicit_positionals
    args, spec_dict = self.argspec(self.body)
  File "/Users/ilaif/Desktop/flask-restplus-server-example/tasks/app/_utils.py", line 21, in argspec
    return super(Task, self).argspec(body)
  File "/usr/local/lib/python2.7/site-packages/invoke/tasks.py", line 144, in argspec
    raise TypeError("Tasks must have an initial Context argument!")
TypeError: Tasks must have an initial Context argument!

I must be missing something very trivial, I event tried to manually pip install the requirements to make sure I have all the dependencies.

Thanks, Ilai.

[frol]

It seems like you are using Invoke <0.13. Either update it or wait a couple of hours while I backport all new features and fixes back to this example project.

[frol]

Please, try the latest master. Both invoke 0.12 and 0.13 should work.