gearbox quickstart ERROR [gearbox] type object 'NewBase' has no attribute '__mutableattributes__'

[Petr Jakes]

I have installed TG using recommended way on Ubuntu 14.04:

sudo pip install virtualenv

sudo virtualenv tgenv

. tgenv/bin/activate

sudo pip install TurboGears2

sudo pip install tg.devtools

gearbox quickstart movies

cd movies

sudo pip install -e .

However starting application ends with following error

(tgenv) petr@home-server:~/movies$ gearbox serve
01:12:43,038 ERROR [gearbox] Failed to load application or server
01:12:43,039 ERROR [gearbox] type object 'NewBase' has no attribute '__mutableattributes__'
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/gearbox/main.py", line 167, in _run_subcommand
    return cmd.run(parsed_args)
  File "/usr/local/lib/python2.7/dist-packages/gearbox/command.py", line 31, in run
    self.take_action(parsed_args)
  File "/usr/local/lib/python2.7/dist-packages/gearbox/commands/serve.py", line 254, in take_action
    relative_to=base, global_conf=parsed_vars)
  File "/usr/local/lib/python2.7/dist-packages/gearbox/commands/serve.py", line 289, in loadapp
    return loadapp(app_spec, name=name, relative_to=relative_to, **kw)
  File "/usr/local/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 247, in loadapp
    return loadobj(APP, uri, name=name, **kw)
  File "/usr/local/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 271, in loadobj
    global_conf=global_conf)
  File "/usr/local/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 296, in loadcontext
    global_conf=global_conf)
  File "/usr/local/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 320, in _loadconfig
    return loader.get_context(object_type, name, global_conf)
  File "/usr/local/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 454, in get_context
    section)
  File "/usr/local/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 476, in _context_from_use
    object_type, name=use, global_conf=global_conf)
  File "/usr/local/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 406, in get_context
    global_conf=global_conf)
  File "/usr/local/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 296, in loadcontext
    global_conf=global_conf)
  File "/usr/local/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 328, in _loadegg
    return loader.get_context(object_type, name, global_conf)
  File "/usr/local/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 620, in get_context
    object_type, name=name)
  File "/usr/local/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 646, in find_egg_entry_point
    possible.append((entry.load(), protocol, entry.name))
  File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 2088, in load
    entry = __import__(self.module_name, globals(),globals(), ['__name__'])
  File "/home/petr/movies/movies/config/middleware.py", line 3, in <module>
    from movies.config.app_cfg import base_config
  File "/home/petr/movies/movies/config/app_cfg.py", line 8, in <module>
    from tg.configuration import AppConfig
  File "/usr/local/lib/python2.7/dist-packages/tg/__init__.py", line 52, in <module>
    from tg.controllers import TGController, RestController, redirect, url, lurl, abort
  File "/usr/local/lib/python2.7/dist-packages/tg/controllers/__init__.py", line 1, in <module>
    from tg.controllers.dispatcher import CoreDispatcher
  File "/usr/local/lib/python2.7/dist-packages/tg/controllers/dispatcher.py", line 21, in <module>
    from tg.decorators import cached_property
  File "/usr/local/lib/python2.7/dist-packages/tg/decorators.py", line 29, in <module>
    from .validation import _ValidationIntent
  File "/usr/local/lib/python2.7/dist-packages/tg/validation.py", line 5, in <module>
    from tw2.core import ValidationError as _Tw2ValidationError
  File "/usr/local/lib/python2.7/dist-packages/tw2/core/__init__.py", line 11, in <module>
    from .widgets import (Widget, CompoundWidget, RepeatingWidget,
  File "/usr/local/lib/python2.7/dist-packages/tw2/core/widgets.py", line 14, in <module>
    from . import validation as vd
  File "/usr/local/lib/python2.7/dist-packages/tw2/core/validation.py", line 30, in <module>
    import formencode
  File "/usr/local/lib/python2.7/dist-packages/formencode/__init__.py", line 4, in <module>
    from formencode.api import (
  File "/usr/local/lib/python2.7/dist-packages/formencode/api.py", line 6, in <module>
    from . import declarative
  File "/usr/local/lib/python2.7/dist-packages/formencode/declarative.py", line 104, in <module>
    class Declarative(six.with_metaclass(DeclarativeMeta, object)):
  File "/usr/lib/python2.7/dist-packages/six.py", line 617, in with_metaclass
    return meta("NewBase", bases, {})
  File "/usr/local/lib/python2.7/dist-packages/formencode/declarative.py", line 71, in __new__
    for name in cls.__mutableattributes__:
AttributeError: type object 'NewBase' has no attribute '__mutableattributes__'

Any hints or comments how to fix it?

Thanks

Petr

 

[Alessandro Molina]

Something pretty odd to me is that you have activated a virtual environment named "tgenv" but you are actually loading a formencode version from "/usr/local/lib/python2.7/dist-packages/" which doesn't cite the tgenv.

First of all there shouldn't be any need to create the virtualenv as root, then try to recreate it with "virtualenv --no-site-packages tgenv" some old versions of virtualenv did import the distribution wide packages into the virtualenv by default.

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