i have one problem with heat which it could not be started.

when i run heat-api it give me below error.

Traceback (most recent call last):
  File "/usr/bin/heat-api", line 38, in <module>
    from heat.common import config
  File "/usr/lib/python2.7/dist-packages/heat/common/config.py", line 28, in <module>
    from heat.common import wsgi
  File "/usr/lib/python2.7/dist-packages/heat/common/wsgi.py", line 41, in <module>
    from paste import deploy
ImportError: cannot import name deploy

my python version

python -V
Python 2.7.6

Please advise.