"TypeError: this._target is null" on CCActionInterval.js

cocos2d-x JavaScript
#1

Hi ,

I am getting "TypeError: this.*target is null "on CCActionInterval.js

var frames = this.animation.getFrames();
var numberOfFrames = frames.length;
for (var i = this._nextFrame; i < numberOfFrames; i+) {
if {
this.*target.setDisplayFrame);
this.nextFrame = i 1;

In the update function it is stopping at line 1960 as of Cocos2d-html5-v2.1 .

Does any one know what might be the error due to?