[16:28:29] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'is' in plugin IridiumSkyblock v3.0.0
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot.jar:git-Spigot-21fe707-e1ebe52]
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spigot.jar:git-Spigot-21fe707-e1ebe52]
	at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:641) ~[spigot.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1162) [spigot.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:997) [spigot.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:45) [spigot.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:1) [spigot.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [spigot.jar:git-Spigot-21fe707-e1ebe52]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_291]
	at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_291]
	at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [spigot.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715) [spigot.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot.jar:git-Spigot-21fe707-e1ebe52]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_291]
Caused by: java.lang.NoSuchMethodError: org.bukkit.block.Block.isPassable()Z
	at com.iridium.iridiumskyblock.utils.LocationUtils.isSafe(LocationUtils.java:23) ~[?:?]
	at com.iridium.iridiumskyblock.utils.LocationUtils.getSafeLocation(LocationUtils.java:37) ~[?:?]
	at com.iridium.iridiumskyblock.managers.IslandManager.teleportHome(IslandManager.java:93) ~[?:?]
	at com.iridium.iridiumskyblock.managers.IslandManager.teleportHome(IslandManager.java:75) ~[?:?]
	at com.iridium.iridiumskyblock.commands.HomeCommand.execute(HomeCommand.java:41) ~[?:?]
	at com.iridium.iridiumskyblock.commands.CommandManager.onCommand(CommandManager.java:164) ~[?:?]
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot.jar:git-Spigot-21fe707-e1ebe52]
	... 15 more
[16:27:48] [Server thread/WARN]: [IridiumSkyblock] Task #25 for IridiumSkyblock v3.0.0 generated an exception
java.lang.NoClassDefFoundError: org/bukkit/block/Container
	at com.iridium.iridiumskyblock.BlockData.setBlock(BlockData.java:58) ~[?:?]
	at com.iridium.iridiumskyblock.managers.SchematicManager.pasteSchematic(SchematicManager.java:108) ~[?:?]
	at com.iridium.iridiumskyblock.managers.SchematicManager.pasteSchematic(SchematicManager.java:82) ~[?:?]
	at com.iridium.iridiumskyblock.managers.IslandManager.pasteSchematic(IslandManager.java:244) ~[?:?]
	at com.iridium.iridiumskyblock.managers.IslandManager.lambda$createIsland$6(IslandManager.java:180) ~[?:?]
	at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71) ~[spigot.jar:git-Spigot-21fe707-e1ebe52]
	at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350) [spigot.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:723) [spigot.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot.jar:git-Spigot-21fe707-e1ebe52]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot.jar:git-Spigot-21fe707-e1ebe52]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_291]
Caused by: java.lang.ClassNotFoundException: org.bukkit.block.Container
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:91) ~[spigot.jar:git-Spigot-21fe707-e1ebe52]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[spigot.jar:git-Spigot-21fe707-e1ebe52]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_291]
	at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_291]
	... 12 more