cannot import 'moldesign' after seems to be successful installation

on Fedora 21 Linux (Python 2.7.8), I installed with: pip install -U moldesign
than tried: >>> import moldesign as mdt , which lead to:

/usr/lib/python2.7/site-packages/nbmolviz/__init__.py:123: UserWarning: Exception while trying to enable nbmolviz extensions: [Errno 13] Permission denied: '/usr/local/share/jupyter'
warnings.warn('Exception while trying to enable nbmolviz extensions: %s' % e)
Installing Jupyter nbmolviz-js extension...
Traceback (most recent call last):
File "", line 1, in
File "/usr/lib/python2.7/site-packages/moldesign/__init__.py", line 29, in
from . import widgets
File "/usr/lib/python2.7/site-packages/moldesign/widgets/__init__.py", line 9, in
from .computeconfig import *
File "/usr/lib/python2.7/site-packages/moldesign/widgets/computeconfig.py", line 20, in
from pip._vendor.packaging import version
ImportError: No module named packaging

Strangely, "sudo pip install packaging" does not help: >>> import moldesign as mdt, now leads to:

Traceback (most recent call last):
File "/bin/jupyter-nbextension", line 11, in
sys.exit(main())
File "/usr/lib/python2.7/site-packages/jupyter_core/application.py", line 267, in launch_instance
return super(JupyterApp, cls).launch_instance(argv=argv, **kwargs)
File "/usr/lib/python2.7/site-packages/traitlets/config/application.py", line 658, in launch_instance
app.start()
File "/usr/lib/python2.7/site-packages/notebook/nbextensions.py", line 969, in start
super(NBExtensionApp, self).start()
File "/usr/lib/python2.7/site-packages/jupyter_core/application.py", line 256, in start
self.subapp.start()
File "/usr/lib/python2.7/site-packages/notebook/nbextensions.py", line 877, in start
self.toggle_nbextension_python(self.extra_args[0])
File "/usr/lib/python2.7/site-packages/notebook/nbextensions.py", line 853, in toggle_nbextension_python
logger=self.log)
File "/usr/lib/python2.7/site-packages/notebook/nbextensions.py", line 459, in enable_nbextension_python
logger=logger)
File "/usr/lib/python2.7/site-packages/notebook/nbextensions.py", line 374, in _set_nbextension_state_python
m, nbexts = _get_nbextension_metadata(module)
File "/usr/lib/python2.7/site-packages/notebook/nbextensions.py", line 1140, in _get_nbextension_metadata
m = import_item(module)
File "/usr/lib/python2.7/site-packages/traitlets/utils/importstring.py", line 42, in import_item
return __import__(parts[0])
ImportError: No module named nbwidgetsextension

There's no 'nbextensions' available via: pip install nbextensions !
It is also not documented, how to install those missing extensions.

Completely stuck !

Frank

Completely stuck !