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Android Animations and Transitions The Transitions Framework Transitioning Back and Forth

transitions back and forth

Ben Jakuben it is continuously telling me to go back to task one. I did task one and succeeded but its refusing to accept any input which I enter into part 2 of 4.

MainActivity.java
public class MainActivity extends Activity {

    protected TransitionManager mTransitionManager;
    protected Scene mScene1;
    protected Scene mScene2;
    protected Scene mCurrentScene;
    protected TransitionSet mForwardSet;
    protected TransitionSet mBackwardSet;

    // Some code omitted for brevity

    public void onButtonClicked(View view) {
        if (mCurrentScene == mScene2) {
            mCurrentScene = mScene1;
        }
        else {
            mCurrentScene = mScene2;
        }
         mTransitionManager.transitionTo(mCurrentScene);
    }

    protected void setupTransitions() {
        // These methods are setting up scenes and transitions sets like in the video
        initScenes();
        initSets(); 

        TransitionManager transition = new TransitionManager();// Start here!
        mTransitionManager.setTransition(mScene1, mScene2, mForwardSet);
        mTransitionManager.setTransition(mScene2, mScene1, mBackwardSet);  
        mScene1.enter();

    }
}