$this->setDataProperty not found

trying to add fireworks but i get unknown $this->setDataProperty

PHP:

protected
    function initEntity(): void
    {
        parent::initEntity();
        $random = self::$random ?? new Random();
        $this->setGenericFlag(self::DATA_FLAG_HAS_COLLISION, true);
        $this->setGenericFlag(self::DATA_FLAG_AFFECTED_BY_GRAVITY, true);
        $data = [
            self::$firework->getId(),
            self::$firework->getDamage(),
            self::$firework->getCount(),
            self::$firework->getCompoundTag()
        ];
        $this->setDataProperty(16, self::DATA_TYPE_SLOT, $data);
        $fly = 1;
        try {
            $fireworktag = $this->namedtag->getCompoundTag("Fireworks");
            if ($fireworktag !== null) {
                $flytag = $fireworktag->getByte("Flight", 1);
                if ($flytag !== null) {
                    $fly = $flytag;
                }
            }
        } catch (Exception $exception) {
            self::$exceptionlog = $exception;
            $this->server->getLogger()->critical(self::$exceptionlog);
        }
        $rint = [
            $random->nextBoundedInt(5),
            $random->nextBoundedInt(7)
        ];
        $this->lifetime = 20 * $fly * $rint[0] + $rint[1];
    }

 

The function doesn't exist, what did you expect?