[01:49:28] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'mail' in plugin UndineMailer v1.5.4
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot_server.jar:git-Spigot-5f38d38-12698ea]
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spigot_server.jar:git-Spigot-5f38d38-12698ea]
	at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:641) ~[spigot_server.jar:git-Spigot-5f38d38-12698ea]
	at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1162) [spigot_server.jar:git-Spigot-5f38d38-12698ea]
	at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:997) [spigot_server.jar:git-Spigot-5f38d38-12698ea]
	at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:45) [spigot_server.jar:git-Spigot-5f38d38-12698ea]
	at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:1) [spigot_server.jar:git-Spigot-5f38d38-12698ea]
	at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [spigot_server.jar:git-Spigot-5f38d38-12698ea]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_66]
	at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_66]
	at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [spigot_server.jar:git-Spigot-5f38d38-12698ea]
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:715) [spigot_server.jar:git-Spigot-5f38d38-12698ea]
	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot_server.jar:git-Spigot-5f38d38-12698ea]
	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot_server.jar:git-Spigot-5f38d38-12698ea]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot_server.jar:git-Spigot-5f38d38-12698ea]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_66]
Caused by: java.lang.NoSuchMethodError: org.bitbucket.ucchy.undine.tellraw.MessageComponent.send(Lorg/bitbucket/ucchy/undine/sender/MailSender;)V
	at org.bitbucket.ucchy.undine.MailManager.sendPager(MailManager.java:1541) ~[?:?]
	at org.bitbucket.ucchy.undine.MailManager.displayInboxList(MailManager.java:576) ~[?:?]
	at org.bitbucket.ucchy.undine.command.UndineInboxCommand.runCommand(UndineInboxCommand.java:76) ~[?:?]
	at org.bitbucket.ucchy.undine.command.UndineCommand.onCommand(UndineCommand.java:74) ~[?:?]
	at org.bitbucket.ucchy.undine.UndineMailer.onCommand(UndineMailer.java:125) ~[?:?]
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot_server.jar:git-Spigot-5f38d38-12698ea]
	... 15 more