Possible Duplicate:
How to clear the IntelliJ project index?
When I open IDEA 11 Android project in IDEA 12, all strings are colored in red.

I can compile and debugger reports no error, but I cannot jump to declaration (Ctrl+B).
This affects strings only, and it’s not the case with styles (as you can see on the image).
Is this a bug in IDEA 12 or I have to force some kind of refresh? I already tried deleting /gen and /out and /bin directories, but it did not help.
The error which appears is Cannot resolve symbol.
You can try to invalidate your caches. To do so, click on “Invalidate caches” in File menu (see pic below).
Note that this will invalide caches of all project for the same version on IntelliJ — so next time you’ll open then IDEA will reindex them (but this will take some time).