ImportError: No module named werkzeug.exceptions

[binford6000]

I'm trying to install calexa. When starting calexa.py the following error appears:

sudo python /opt/calexa/src/calexa.py
Traceback (most recent call last):
File "/opt/calexa/src/calexa.py", line 13, in
from flask import Flask
File "/usr/local/lib/python2.7/dist-packages/flask/init.py", line 17, in
from werkzeug.exceptions import abort
ImportError: No module named werkzeug.exceptions

flask-aks is allready installed:
sudo pip install flask-ask
Requirement already satisfied (use --upgrade to upgrade): flask-ask in /usr/local/lib/python2.7/dist-packages
Cleaning up...

Any ideas?
Sebastian

Solved it. All dependencies installed as errors thrown by the script. Just straight forward
"sudo pip install xyz..."
Greetings, Sebastian