Solved how do i fix with setting cape to player?

I'm writing set cape but error occurred.
here's the error
InvalidStateException: "Specified skin is not valid, must be 8KiB or 16KiB" (EXCEPTION) in "src/pocketmine/entity/Human" at line 148

and code

PHP:

        $player = $event->getPlayer();
        $path = $this->getDataFolder().'test.png'; //image path
        $oldSkin = $player->getSkin();
       
        $im = imagecreatefrompng($path);
        $rgba = "";
       
        for($y = 0; $y < imagesy($im); $y++) {
            for($x = 0; $x < imagesx($im); $x++) {
                $rgb = imagecolorat($im, $x, $y);
                $r = ($rgb >> 16) & 0xFF;
                $g = ($rgb >> 8) & 0xFF;
                $b = $rgb & 0xFF;
                $rgba .= chr($r).chr($g).chr($b).chr(255);
            }
        }
       
        $skin = new Skin($oldSkin->getSkinId(), $oldSkin->getSkinData(), $rgba, $oldSkin->getGeometryName(), $oldSkin->getGeometryData());
        $player->setSkin($skin);
        $player->sendSkin();


 

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sorry. but it solved thank you