I Dont know what wrong?

error
[13:02:02] [Server thread/CRITICAL]: Error: "Call to undefined method pocketmine\item\enchantment\Enchantment::setLevel()" (EXCEPTION) in "SnowixAPI/src/plugin/main" at line 116
[13:02:02] [Server thread/DEBUG]: #0 src/pocketmine/plugin/MethodEventExecutor(38): plugin\main->JoinItems(pocketmine\event\player\PlayerJoinEvent object)
[13:02:02] [Server thread/DEBUG]: #1 src/pocketmine/plugin/RegisteredListener(98): pocketmine\plugin\MethodEventExecutor->execute(plugin\main object, pocketmine\event\player\PlayerJoinEvent object)
[13:02:02] [Server thread/DEBUG]: #2 src/pocketmine/plugin/PluginManager(687): pocketmine\plugin\RegisteredListener->callEvent(pocketmine\event\player\PlayerJoinEvent object)
[13:02:02] [Server thread/DEBUG]: #3 src/pocketmine/Player(966): pocketmine\plugin\PluginManager->callEvent(pocketmine\event\player\PlayerJoinEvent object)
[13:02:02] [Server thread/DEBUG]: #4 src/pocketmine/Player(914): pocketmine\Player->doFirstSpawn()
[13:02:02] [Server thread/DEBUG]: #5 src/pocketmine/level/Level(2552): pocketmine\Player->sendChunk(integer 8, integer 11, pocketmine\network\mcpe\protocol\BatchPacket object)
[13:02:02] [Server thread/DEBUG]: #6 src/pocketmine/level/Level(2571): pocketmine\level\Level->sendChunkFromCache(integer 8, integer 11)
[13:02:02] [Server thread/DEBUG]: #7 src/pocketmine/level/Level(819): pocketmine\level\Level->processChunkRequest()
[13:02:02] [Server thread/DEBUG]: #8 src/pocketmine/Server(2395): pocketmine\level\Level->doTick(integer 20740)
[13:02:02] [Server thread/DEBUG]: #9 src/pocketmine/Server(2552): pocketmine\Server->checkTickUpdates(integer 20740, double 1519477322.2195)
[13:02:02] [Server thread/DEBUG]: #10 src/pocketmine/Server(2291): pocketmine\Server->tick()
[13:02:02] [Server thread/DEBUG]: #11 src/pocketmine/Server(2164): pocketmine\Server->tickProcessor()
[13:02:02] [Server thread/DEBUG]: #12 src/pocketmine/Server(1747): pocketmine\Server->start()
[13:02:02] [Server thread/DEBUG]: #13 src/pocketmine/PocketMine(385): pocketmine\Server->__construct(BaseClassLoader object, pocketmine\utils\MainLogger object, string /snowix-1.2/, string /snowix-1.2/plugins/)
[13:02:02] [Server thread/DEBUG]: #14 /snowix-1.2/PocketMine-MP.phar(1): require(string phar:///snowix-1.2/PocketMine-MP.phar/src/pocketmine/PocketMine.php)
[13:02:02] [Server thread/CRITICAL]: Could not pass event 'pocketmine\event\player\PlayerJoinEvent' to 'SnowixAPI v1.1': Class 'pocketmine\scheduler\CallbackTask' not found on plugin\main
[13:02:02] [Server thread/CRITICAL]: Error: "Class 'pocketmine\scheduler\CallbackTask' not found" (EXCEPTION) in "SnowixAPI/src/plugin/main" at line 146
[13:02:02] [Server thread/DEBUG]: #0 src/pocketmine/plugin/MethodEventExecutor(38): plugin\main->onPlayerJoinEvent(pocketmine\event\player\PlayerJoinEvent object)
[13:02:02] [Server thread/DEBUG]: #1 src/pocketmine/plugin/RegisteredListener(98): pocketmine\plugin\MethodEventExecutor->execute(plugin\main object, pocketmine\event\player\PlayerJoinEvent object)
[13:02:02] [Server thread/DEBUG]: #2 src/pocketmine/plugin/PluginManager(687): pocketmine\plugin\RegisteredListener->callEvent(pocketmine\event\player\PlayerJoinEvent object)
[13:02:02] [Server thread/DEBUG]: #3 src/pocketmine/Player(966): pocketmine\plugin\PluginManager->callEvent(pocketmine\event\player\PlayerJoinEvent object)
[13:02:02] [Server thread/DEBUG]: #4 src/pocketmine/Player(914): pocketmine\Player->doFirstSpawn()
[13:02:02] [Server thread/DEBUG]: #5 src/pocketmine/level/Level(2552): pocketmine\Player->sendChunk(integer 8, integer 11, pocketmine\network\mcpe\protocol\BatchPacket object)
[13:02:02] [Server thread/DEBUG]: #6 src/pocketmine/level/Level(2571): pocketmine\level\Level->sendChunkFromCache(integer 8, integer 11)
[13:02:02] [Server thread/DEBUG]: #7 src/pocketmine/level/Level(819): pocketmine\level\Level->processChunkRequest()
[13:02:02] [Server thread/DEBUG]: #8 src/pocketmine/Server(2395): pocketmine\level\Level->doTick(integer 20740)
[13:02:02] [Server thread/DEBUG]: #9 src/pocketmine/Server(2552): pocketmine\Server->checkTickUpdates(integer 20740, double 1519477322.2195)
[13:02:02] [Server thread/DEBUG]: #10 src/pocketmine/Server(2291): pocketmine\Server->tick()
[13:02:02] [Server thread/DEBUG]: #11 src/pocketmine/Server(2164): pocketmine\Server->tickProcessor()
[13:02:02] [Server thread/DEBUG]: #12 src/pocketmine/Server(1747): pocketmine\Server->start()
[13:02:02] [Server thread/DEBUG]: #13 src/pocketmine/PocketMine(385): pocketmine\Server->__construct(BaseClassLoader object, pocketmine\utils\MainLogger object, string /snowix-1.2/, string /snowix-1.2/plugins/)
[13:02:02] [Server thread/DEBUG]: #14 /snowix-1.2/PocketMine-MP.phar(1): require(string phar:///snowix-1.2/PocketMine-MP.phar/src/pocketmine/PocketMine.php)

 

Recently, the Enchantment API was changed. Enchantment::setLevel() was moved to EnchantmentInstance::setLevel().

The new method is to use Item::addEnchantment() with an EnchantmentInstance.

PHP:

$item->addEnchantment(new EnchantmentInstance($enchant, $level));