Unresolved reference for built ins in intelliJ IDEA 12.1.4 with python plugin on Mac OS X

Unresolved reference for built ins in intelliJ IDEA 12.1.4 with python
plugin on Mac OS X

I'am trying to use the python plugin in IntelliJ Idea 12.1.4 but when i
try to import some built in module it gets underlined like it is an
unresolved reference:

It also happens with common methods like str and open:
This is how Project Structure -> Project -> Project SDK looks like:
And this is how Project Structure -> SDKs looks like:
I can run the scripts normally from command line