Error adding 'import lettuce' on PyCharm

I have a problem with Python and lettuce.

I already install the pip and lettuce in Python 2.7, and I'm trying to create a .features file and a .py file for the steps. The problem is that when I put the line from lettuce import * I have an error that says:

"Unresolved reference lettuce..." and then: "this inspection detects names that should resolved but don't. Due to dynamic dispatch and duck typing, this is possible in a limited but useful number of cases. Top-level and class-level items are supported better than instance items".

I really don´t know how to fix this problem. Can anyone can help me please?

Solution

I just found the problem. What I did, just in case anyone has the same problem is:

In my PyCharm project:

press Ctrl+Alt+s to open the settings
on the left column, select Project Interpreter
on the top right there is a list of python binaries found on your system, pick the right one
eventually click the + button to install additional python modules
validate

enter image description here

Just in case you are not able to add an other module (that happened to me as well) you can change the project interpreter.

Hope this works!