Solved How to fix this error?

"Cannot access dynamic field "Pos": Dynamic field access on pocketmine\nbt\tag\CompoundTag is no longer supported"

 

Dynamic access was deprecated in god know which version. Use this instead

PHP:

$nbt->getTag('Pos'); // iirc


 

I can spawn the NPC but in a couple of milliseconds it's disappear

PHP:

$nbt = new CompoundTag;
$nbt->setTag(new ListTag('Pos', [
    new DoubleTag("", $player->getX() + 0.5),
    new DoubleTag("", $player->getY()),
    new DoubleTag("", $player->getZ() + 0.5)
]));
$nbt->setTag(new ListTag('Motion', [
    new DoubleTag("", 0),
    new DoubleTag("", 0),
    new DoubleTag("", 0)
]));
$nbt->setTag(new ListTag('Rotation', [
    new DoubleTag("", 0),
    new DoubleTag("", 0)
]));
$nbt->setTag(new ShortTag('Health', 20));
$nbt->setTag(new StringTag('Name', $player->getLowerCaseName()));

$nbt->setTag(new CompoundTag('Skin', [
    "Data" => new ByteArrayTag("Data", $player->getSkin()->getSkinData()),
    "Name" => new StringTag("Name", $player->getSkin()->getSkinId())
]));

$npc = new Human($player->getLevel(), $nbt);
$npc->setNameTagVisible(false);
$npc->spawnTo($player);


And also the skin of NPC is not player skin

 

Did you register the entity?