CCActionFollow will not follow the target object and scroll layer

Question

I have a ball object that falls straight down a level made in SpriteBuilder as a layer. The level is added to the gameplay scene, which has a ccnode (_levelNode) as a child of the physics node. However, when the game runs it either doesn't scroll, or the view is messed up.

My code is:

- (void)didLoadFromCCB {
//_physicsNode.debugDraw = TRUE;

_loadedLevel = [CCBReader load:@"levels/Level1" owner:self];
[_levelNode addChild: _loadedLevel];

}

- (void)onEnter {
[super onEnter];

self.userInteractionEnabled = TRUE;
self.isGamePaused = FALSE;

_followBall = [CCActionFollow actionWithTarget:_ball worldBoundary:[_loadedLevel boundingBox]];
[_physicsNode runAction:_followBall];

}