Today I updated my Android SDK in eclipse to the last version using the Android SDK Manager.
After the update was over, eclipse console was giving me this error message:
[2013-12-28 10:45:08 - Framework Resource Parser] Collect preferences failed, class java/lang/AutoCloseable not found in C:\Users\<username>\android-sdks\platforms\android-19\android.jar
Well I solved it simply by updatng the ADT eclipse plugin to the last available version.
In eclipse open: Help > Check for updates and let it work, then accept the new software to be installed.
Hope it helps somebody else!