The 'tildes' distribution was not found and is required by the application

Hi,

I have an error when I'm trying to run pshell development.ini command.

Here's the entire log from the terminal

tildes@AMS-148750:/opt/tildes$ pshell development.ini
Traceback (most recent call last):
  File "/usr/bin/pshell", line 9, in <module>
    load_entry_point('pyramid==1.6', 'console_scripts', 'pshell')()
  File "/usr/lib/python2.7/dist-packages/pyramid/scripts/pshell.py", line 21, in main
    return command.run()
  File "/usr/lib/python2.7/dist-packages/pyramid/scripts/pshell.py", line 121, in run
    env = self.bootstrap[0](config_uri, options=parse_vars(self.args[1:]))
  File "/usr/lib/python2.7/dist-packages/pyramid/paster.py", line 131, in bootstrap
    app = get_app(config_uri, options=options)
  File "/usr/lib/python2.7/dist-packages/pyramid/paster.py", line 31, in get_app
    global_conf=options)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 247, in loadapp
    return loadobj(APP, uri, name=name, **kw)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 271, in loadobj
    global_conf=global_conf)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 296, in loadcontext
    global_conf=global_conf)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 320, in _loadconfig
    return loader.get_context(object_type, name, global_conf)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 454, in get_context
    section)
  File "/usr/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/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 406, in get_context
    global_conf=global_conf)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 296, in loadcontext
    global_conf=global_conf)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 328, in _loadegg
    return loader.get_context(object_type, name, global_conf)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 620, in get_context
    object_type, name=name)
  File "/usr/lib/python2.7/dist-packages/paste/deploy/loadwsgi.py", line 640, in find_egg_entry_point
    pkg_resources.require(self.spec)
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 963, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 849, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'tildes' distribution was not found and is required by the application

Please help me out with this. Thanks.