Wtf not importing into Pycharm?

Question

Flask

The wtf module is not imported into pycharme, already installed in the python 2.7 folder itself and still the same error ImportError: No module named flask.ext.wtf.FileField.
What could be the problem?
I point to the import itself and the IDE prompts me to install wtf, it says the installation is complete, and when I start the project, I still get an error that there is no module. I import like this

from flask.ext.wtf import Form
from wtforms import StringField, BooleanField
from wtforms.validators import DataRequired