这个帧动画为什么出现这个错误

Cocos2d-x
#1

代码如下：

SpriteFrameCache::getInstance()->addSpriteFramesWithFile("a.plist");
	auto pSprite2 = Sprite::create();
	pSprite2->setPosition(500, 600);
	this->addChild(pSprite2,2);
	Vector<SpriteFrame*>list;
	list.reserve(2);
	list.pushBack(SpriteFrameCache::getInstance()->getSpriteFrameByName("10001.png"));
	list.pushBack(SpriteFrameCache::getInstance()->getSpriteFrameByName("10002.png"));
	list.pushBack(SpriteFrameCache::getInstance()->getSpriteFrameByName("10003.png"));
	list.pushBack(SpriteFrameCache::getInstance()->getSpriteFrameByName("10004.png"));
	list.pushBack(SpriteFrameCache::getInstance()->getSpriteFrameByName("10005.png"));
	list.pushBack(SpriteFrameCache::getInstance()->getSpriteFrameByName("10006.png"));
	list.pushBack(SpriteFrameCache::getInstance()->getSpriteFrameByName("10007.png"));
	list.pushBack(SpriteFrameCache::getInstance()->getSpriteFrameByName("10008.png"));
	list.pushBack(SpriteFrameCache::getInstance()->getSpriteFrameByName("10009.png"));
	list.pushBack(SpriteFrameCache::getInstance()->getSpriteFrameByName("100010.png"));
	list.pushBack(SpriteFrameCache::getInstance()->getSpriteFrameByName("100011.png"));
	auto pAnimation = Animation::createWithSpriteFrames(list, 5.0f, 100);
	auto pAnimate = Animate::create(pAnimation);
	pSprite2->runAction(pAnimate);

错误如下：
捕获

#2 
void pushBack(T object)
    {
        CCASSERT(object != nullptr, "The object should not be nullptr");
        _data.push_back( object );
        object->retain();
    }

精灵帧==nulltptr，你看你的精灵帧路径对不对吧