How to add KnockBack to an Stick?

I tried this

PHP:

$item = Item::get(280, 0, 
 $item->addEnchantment(Enchantment::getEnchantment(Enchantment::KNOCKBACK)->setLevel(1));
 $item->setCustomName(TextFormat::GOLD.TextFormat::ITALIC.'KNOCKBACK');
 $player->getInventory()->setItem(0, $item, TRUE);

But it return:

Code:

[06:30:35] [Server thread/CRITICAL]: Could not execute task SkyZoneMC\OneLine\OLTask: Call to a member function setLevel() on null
[06:30:35] [Server thread/CRITICAL]: Error: "Call to a member function setLevel() on null" (EXCEPTION) in "OneLine - SkyZoneMC/src/SkyZoneMC/OneLine/OneLine" at line 829

I dont know how to fix this ._.

 

Because it's PMMP. Check it https://github.com/pmmp/PocketMine-MP/blob/master/src/pocketmine/item/enchantment/Enchantment.php. You must correct it by yourself. Or wait updates

 

if you do not understand, then they did not add the enchantment

 

To make it clear:
The knockback enchantment isn't registered yet as you can see here https://github.com/pmmp/PocketMine-...mine/item/enchantment/Enchantment.php#L89-L95

 

You can create new enchant and try add it to stick

PHP:

$item = Item::get(Item::STICK, 0, 1);
$enchantment = new Enchantment(Enchantment::KNOCKBACK, "Knockback", 1, Enchantment::ACTIVATION_HELD, 0);
$enchantment->setLevel(1);
$item->addEnchantment($enchantment);
$p->getInventory()->addItem($item);
$p->getInventory()->addItem(Item::get(Item::ARROW, 0, 1));