I’m certain there isn’t any error within the location of the plist file and png picture, why is that this error nonetheless displaying?
the code as follows:

SpriteFrameCache::getInstance()->addSpriteFramesWithFile("/protagonist_move/a.plist");
	auto pSprite2 = Sprite::create();
	pSprite2->setPosition(500, 600);
	this->addChild(pSprite2,2);
	Vector<SpriteBody*>record;
	record.reserve(2);
	record.pushBack(SpriteFrameCache::getInstance()->getSpriteFrameByName("/protagonist_move/10001.png"));
    record.pushBack(SpriteFrameCache::getInstance()->getSpriteFrameByName("/protagonist_move/10002.png"));
	auto pAnimation = Animation::createWithSpriteFrames(record, 0.2f, 1000);
	auto pAnimate = Animate::create(pAnimation);
	pSprite2->runAction(pAnimate);

the errors as follows:

please take away “/” from “”/protagonist_move/a.plist” => ““protagonist_move/a.plist”

The drawback nonetheless exists after modification

I uploaded the demo file, please check out what’s the drawback.
demo.zip (1.2 MB)

The right sprite body title is “10020.png” and “10021.png”, you’ll be able to test it in aaaa.plist, additionally you don’t want 10020.png and 10021.png, the aaaa.plist will add aaaa.png.

If 10020.png and 10021.png are usually not wanted, how ought to the code be written?

The a.plist ought to containing the sprite body title, then you need to use the title to get the body from cache.

https://docs.cocos.com/cocos2d-x/guide/en/sprites/spriteframe_cache.html

The following is an announcement that fetches frames from the cache:

SpriteFrameCache::getInstance()->getSpriteFrameByName("protagonist_move/10020.png")

This sentence is contained within the following code:

	SpriteFrameCache::getInstance()->addSpriteFramesWithFile("protagonist_move/aaaa.plist");
	auto pSprite2 = Sprite::create();
	pSprite2->setPosition(500, 600);
	this->addChild(pSprite2, 2);
	Vector<SpriteBody*>record;
	record.reserve(2);
	record.pushBack(SpriteFrameCache::getInstance()->getSpriteFrameByName("protagonist_move/10020.png"));
	record.pushBack(SpriteFrameCache::getInstance()->getSpriteFrameByName("protagonist_move/10021.png"));
	auto pAnimation = Animation::createWithSpriteFrames(record, 0.2f, 1000);
	auto pAnimate = Animate::create(pAnimation);
	pSprite2->runAction(pAnimate);

But the error within the title seems after working. doesn’t clear up the issue.

In your demo.zip, the aaaa.plist incorporates 2 sprite body, which named 10020.png and 10021.png, while you add aaaa.plist to SpriteFrameCache, get the SpriteBody by title 10020.png and 10021.png.
May be you misunderstand the utilization of sprite sheet and sprite body cache.
You don’t want /demo/Resources/protagonist_move/10020.png and 10021.png within the venture when including sprite sheet to SpriteFrameCache, simply aaaa.plist and aaaa.png is sufficient.
All the wanted data is saved in aaaa.plist, you’ll be able to test it by textual content editor.

Please look additionally on the examples on cpp_test.
Plz learn additionally the doc. The API und perhaps additionally some c++ Tutorials too.
I belive you be a c++ newbie.