00:13:01 [SEVERE] Error occurred while enabling Multiverse-Portals v2.0-b143 (Is it up to date?): com/pneumaticraft/commandhandler/Command$ReverseLengthSorter
java.lang.IllegalAccessError: com/pneumaticraft/commandhandler/Command$ReverseLengthSorter
        at com.pneumaticraft.commandhandler.Command.addKey(Command.java:212)
        at com.onarandombox.MultiversePortals.commands.InfoCommand.<init>(InfoCommand.java:21)
        at com.onarandombox.MultiversePortals.MultiversePortals.registerCommands(MultiversePortals.java:206)
        at com.onarandombox.MultiversePortals.MultiversePortals.onEnable(MultiversePortals.java:93)
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:126)
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:878)
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:278)
        at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:164)
        at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:148)
        at net.minecraft.server.MinecraftServer.e(MinecraftServer.java:286)
        at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:273)
        at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:149)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:337)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:422)