Android Studio (1.5.1) -- Error: cannot find symbol class / App won't run
I'm working on my first Android application. It's a very simple farenheit/celsius converter, and all of my IDs, methods, and buttons/text fields are perfectly copied out. I triple checked. (I'm following instructions from a video my professor posted.) However, I'm having difficulty trying to get Android Studio to run the application.
I've found plenty of questions similar to this one and many of them suggest synchronizing the gradle files. So I did. I'm still getting these same error messages: