ext-all-debug.js:9184 [E] Error while running task - TypeError: Cannot read property 'down' of undefined
Caller: function () {
        var me = this,
            items = me.items.getRange(),
            i = 0,
            len = items.length,
            anim;
        //Ext.log('      executing anim runner task with ', len, ' items');
        me.targetArr = {};
        // Single timestamp for all animations this interval
        me.timestamp = new Date();
        // Loop to start any new animations first before looping to
        // execute running animations (which will also include all animations
        // started in this loop). This is a subtle difference from simply
        // iterating in one loop and starting then running each animation,
        // but separating the loops is necessary to ensure that all new animations
        // actually kick off prior to existing ones regardless of array order.
        // Otherwise in edge cases when there is excess latency in overall
        // performance, allowing existing animations to run before new ones can
        // lead to dropped frames and subtle race conditions when they are
        // interdependent, which is often the case with certain Element fx.
        for (; i < len; i++) {
            anim = items[i];
            if (anim.isReady()) {
                //Ext.log('      starting anim ', anim.id, ', target: ', anim.target.id);
                me.startAnim(anim);
            }
        }
        for (i = 0; i < len; i++) {
            anim = items[i];
            if (anim.isRunning()) {
                //Ext.log('      running anim ', anim.target.id);
                me.runAnim(anim);
            }
        }
        //else if (!me.useCSS3) {
        // When using CSS3 transitions the animations get paused since they are not
        // needed once the transition is handed over to the browser, so we can
        // ignore this case. However if we are doing JS animations and something is
        // paused here it's possibly unintentional.
        //Ext.log(' (i)  anim ', anim.id, ' is active but not running...');
        //}
        // Apply all the pending changes to their targets
        me.applyPendingAttrs();
        // Avoid retaining target references after we are finished with anims
        me.targetArr = null;
    }