I’ve been getting this error when running paster for my Pylons project:

shakir@herugrim ~/Misc/workspace $ paster serve –reload development.ini
Starting subprocess with file monitor
/var/lib/python-support/python2.5/pylons/wsgiapp.py:249: DeprecationWarning: SessionMiddleware is moving to beaker.middleware in 0.8
  app = SessionMiddleware(app, config.global_conf, **config.app_conf)
/var/lib/python-support/python2.5/pylons/wsgiapp.py:254: DeprecationWarning: CacheMiddleware is moving to beaker.middleware in 0.8
  app = CacheMiddleware(app, config.global_conf, **config.app_conf)
Starting server in PID 8550.
serving on 0.0.0.0:5000 view at http://127.0.0.1:5000

On my quest to solving it, I uninstall Pylons (its whole bunch of dependencies);

sudo apt-get remove python-pylons

and install it back again, but this time using easy_install;

sudo easy_install Pylons

Yeay, I’m now good to proceed. Happy coding to me