No NMS Handler found for v1_16_R2, falling back to Bukkit API.
[23:48:20 ERROR]: Error occurred while enabling ASkyBlock v3.0.9.4 (Is it up to date?)
java.lang.NoSuchMethodError: 'void org.bukkit.inventory.ItemStack.<init>(int, int, short)'
        at com.wasteofplastic.askyblock.schematics.IslandBlock.setChest(IslandBlock.java:480) ~[?:?]
        at com.wasteofplastic.askyblock.schematics.Schematic.prePasteSchematic(Schematic.java:1199) ~[?:?]
        at com.wasteofplastic.askyblock.schematics.Schematic.<init>(Schematic.java:645) ~[?:?]
        at com.wasteofplastic.askyblock.commands.IslandCmd.loadSchematics(IslandCmd.java:161) ~[?:?]
        at com.wasteofplastic.askyblock.commands.IslandCmd.<init>(IslandCmd.java:134) ~[?:?]
        at com.wasteofplastic.askyblock.ASkyBlock.onEnable(ASkyBlock.java:358) ~[?:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263) ~[patched_1.16.3.jar:git-Paper-232]
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:380) ~[patched_1.16.3.jar:git-Paper-232]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:483) ~[patched_1.16.3.jar:git-Paper-232]
        at org.bukkit.craftbukkit.v1_16_R2.CraftServer.enablePlugin(CraftServer.java:501) ~[patched_1.16.3.jar:git-Paper-232]
        at org.bukkit.craftbukkit.v1_16_R2.CraftServer.enablePlugins(CraftServer.java:415) ~[patched_1.16.3.jar:git-Paper-232]
        at org.bukkit.craftbukkit.v1_16_R2.CraftServer.reload(CraftServer.java:939) ~[patched_1.16.3.jar:git-Paper-232]
        at org.bukkit.Bukkit.reload(Bukkit.java:699) ~[patched_1.16.3.jar:git-Paper-232]
        at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:54) ~[patched_1.16.3.jar:git-Paper-232]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:159) ~[patched_1.16.3.jar:git-Paper-232]
        at org.bukkit.craftbukkit.v1_16_R2.CraftServer.dispatchCommand(CraftServer.java:802) ~[patched_1.16.3.jar:git-Paper-232]
        at org.bukkit.craftbukkit.v1_16_R2.CraftServer.dispatchServerCommand(CraftServer.java:764) ~[patched_1.16.3.jar:git-Paper-232]
        at net.minecraft.server.v1_16_R2.DedicatedServer.handleCommandQueue(DedicatedServer.java:405) ~[patched_1.16.3.jar:git-Paper-232]
        at net.minecraft.server.v1_16_R2.DedicatedServer.b(DedicatedServer.java:372) ~[patched_1.16.3.jar:git-Paper-232]
        at net.minecraft.server.v1_16_R2.MinecraftServer.a(MinecraftServer.java:1211) ~[patched_1.16.3.jar:git-Paper-232]
        at net.minecraft.server.v1_16_R2.MinecraftServer.w(MinecraftServer.java:999) ~[patched_1.16.3.jar:git-Paper-232]
        at net.minecraft.server.v1_16_R2.MinecraftServer.lambda$a$0(MinecraftServer.java:177) ~[patched_1.16.3.jar:git-Paper-232]
        at java.lang.Thread.run(Thread.java:834) [?:?]
[23:48:20 INFO]: [ASkyBlock] Disabling ASkyBlock v3.0.9.4