[18:37:38 ERROR]: Error occurred while enabling Lobby v1.0 (Is it up to date?)
java.lang.IllegalArgumentException: This registration already exists
        at org.bukkit.plugin.messaging.StandardMessenger.addToIncoming(StandardMessenger.java:91) ~[PaperSpigot.jar:git-PaperSpigot-"8b18730"]
        at org.bukkit.plugin.messaging.StandardMessenger.registerIncomingPluginChannel(StandardMessenger.java:217) ~[PaperSpigot.jar:git-PaperSpigot-"8b18730"]
        at de.dave_911.Lobby.Lobby.onEnable(Lobby.java:165) ~[?:?]
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321) ~[PaperSpigot.jar:git-PaperSpigot-"8b18730"]
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:332) [PaperSpigot.jar:git-PaperSpigot-"8b18730"]
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:404) [PaperSpigot.jar:git-PaperSpigot-"8b18730"]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugin(CraftServer.java:359) [PaperSpigot.jar:git-PaperSpigot-"8b18730"]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.enablePlugins(CraftServer.java:318) [PaperSpigot.jar:git-PaperSpigot-"8b18730"]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.reload(CraftServer.java:769) [PaperSpigot.jar:git-PaperSpigot-"8b18730"]
        at org.bukkit.Bukkit.reload(Bukkit.java:556) [PaperSpigot.jar:git-PaperSpigot-"8b18730"]
        at org.bukkit.command.defaults.ReloadCommand.execute(ReloadCommand.java:25) [PaperSpigot.jar:git-PaperSpigot-"8b18730"]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:143) [PaperSpigot.jar:git-PaperSpigot-"8b18730"]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:666) [PaperSpigot.jar:git-PaperSpigot-"8b18730"]
        at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchServerCommand(CraftServer.java:629) [PaperSpigot.jar:git-PaperSpigot-"8b18730"]
        at net.minecraft.server.v1_8_R3.DedicatedServer.aO(DedicatedServer.java:416) [PaperSpigot.jar:git-PaperSpigot-"8b18730"]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:379) [PaperSpigot.jar:git-PaperSpigot-"8b18730"]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:713) [PaperSpigot.jar:git-PaperSpigot-"8b18730"]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:616) [PaperSpigot.jar:git-PaperSpigot-"8b18730"]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]