마크 kettle 버킷에서 매직스펠 3.3버전을 사용하는데 자꾸 이게 뜨면서 실행이 안되네요ㅠㅠ

[22:19:42] [Server thread/ERROR] [Minecraft]: Error occurred while enabling MagicSpells v3.3-release (Is it up to date?)

java.lang.NoSuchMethodError: org.bukkit.Bukkit.getOnlinePlayers()[Lorg/bukkit/entity/Player;

        at com.nisovin.magicspells.LifeLengthTracker.<init>(LifeLengthTracker.java:21) ~[?:?]

        at com.nisovin.magicspells.MagicSpells.load(MagicSpells.java:283) ~[?:?]

        at com.nisovin.magicspells.MagicSpells.onEnable(MagicSpells.java:150) ~[?:?]

        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:256) ~[JavaPlugin.class:git-HEAD-e461dd7-dirty]

        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:337) [JavaPluginLoader.class:git-HEAD-e461dd7-dirty]

        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:403) [SimplePluginManager.class:git-HEAD-e461dd7-dirty]

        at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugin(CraftServer.java:420) [CraftServer.class:git-HEAD-e461dd7-dirty]

        at org.bukkit.craftbukkit.v1_12_R1.CraftServer.enablePlugins(CraftServer.java:379) [CraftServer.class:git-HEAD-e461dd7-dirty]

        at net.minecraft.server.MinecraftServer.func_71243_i(MinecraftServer.java:620) [MinecraftServer.class:?]

        at net.minecraft.server.MinecraftServer.func_71222_d(MinecraftServer.java:581) [MinecraftServer.class:?]

        at net.minecraft.server.MinecraftServer.func_71247_a(MinecraftServer.java:537) [MinecraftServer.class:?]

        at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:329) [nz.class:?]

        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:711) [MinecraftServer.class:?]

        at java.lang.Thread.run(Unknown Source) [?:1.8.0_251]