Flask ImportError No Module Named Flask

Question

I followed this flask tutorial: http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-i-hello-world.

I am getting this error at the part where I run ./run.py :

Traceback (most recent call last):

  File "./run.py", line 3, in <module>

    from app import app

  File "/Users/benjaminclayman/Desktop/microblog/app/__init__.py", line 1, in <module>

    from flask import Flask

ImportError: No module named flask

Can someone help me with this issue?