Apps New to developers and Android

[Toast2120]

Good day to everyone, I'm new to the whole Android thing, and got pretty far in installing Eclipse and the Android SDK. Got the Emulator running and tried some code in Eclipse but I get this error

The project cannot be built until build path errors are resolved

What have I done wrong?

 

[Toast2120]

Found my answer, was required to "Clean" my project under the Project tab.