Cannot resolve symbol

Hey, I just started using IntelliJ IDEA a few days ago and I have fell in love with it.

However, I can't seem to fix this one error. On package names, varables, and imports I'm getting a error that says: "Cannot resolve symbol '<insert thing here>'".
Here are some images:
screenshot.17.png
screenshot.18.png
Yet when I export my jar it works fine. And yes, I have tried to invalidate the cache, and also deleting the ".IntelliJIdea13". Again, to no avail D:
If someone knows how I could fix this, that would be great.

Thanks.

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