Invalid skin data size 40 bytes

Error:


I downloaded this 64x64 skin: https://minecraft.novaskin.me/skin/1154583057/64x64
Now it says that the skin data size is invalid. The Skin is in .png-Format.
What to do?

How i set the Skin:

PHP:

$nbt->setTag( new CompoundTag("Skin", [
    "Data" => new StringTag("Data", Server::getInstance()->getDataPath() . "/plugin_data/NPC/skin.png"),
    "Name" => new StringTag("Name", "Standart_Custom")
]));


My full function:

PHP:

public function addNPC(){
    $nbt = new CompoundTag;
    $path = $this->getDataFolder() . "skin.png";
    $img = @\imagecreatefrompng($path);
    $byte = "";
    for($y = 0, $height = imagesy($img); $y < $height; $y++){
        for($x = 0, $width = imagesx($img); $x < $width; $x++){
            $color = imagecolorat($img, $x, $y);
            $byte .= pack("c", ($color >> 16) & 0xFF)
                . pack("c", ($color >> 8) & 0xFF)
                . pack("c", $color & 0xFF)
                . pack("c", 255 - (($color & 0x7F000000) >> 23));
        }
    }

    $nbt->setTag( new ListTag("Pos", [
        new DoubleTag("X", "-26.6"),
        new DoubleTag("Y", "50"),
        new DoubleTag("Z", "4.49")
    ]));

    $nbt->setTag( new ListTag("Motion", [
        new DoubleTag("", 0),
        new DoubleTag("", 0),
        new DoubleTag("", 0)
    ]));

    $nbt->setTag( new ListTag("Rotation", [
        new FloatTag("", "275"), //230, 250
        new FloatTag("", "0")
    ]));

    $nbt->setTag(new ShortTag("Health", 20));

    $nbt->setTag( new CompoundTag("Skin", [
        "Data" => new StringTag("Data", $this->getDataFolder() . "skin.png"),
        "Name" => new StringTag("Name", "Standart_Custom")
    ]));

    $level = Server::getInstance()->getLevelByName("world");
    $human = new Human($level, $nbt);
    $human->setNameTag("§bSkyBlock\n§r§lTIPPE MICH ZUM BEITRETEN!");
    $human->setNameTagVisible(false);
    $human->setScale(1.5);
    $human->spawnToAll();
}


PocketMine only allowes this sizes:
Skin.php (PocketMine.php):

PHP:

public const ACCEPTED_SKIN_SIZES = [
   64 * 32 * 4,
   64 * 64 * 4,
   128 * 128 * 4
]; 

I created my skin in BlockBench and it is 64 x 64...

 

Skin data needs to be a byte array containing the individual pixels.
I made a virion that converts PNG to skin data and vice versa, you can see how it does that or directly use it in your plugin: https://github.com/HimbeersaftLP/Li...src/Himbeer/LibSkin/SkinConverter.php#L45-L78