11:57:08 [SEVERE] Error occurred while enabling Vault v1.2.15-b172 (Is it up to date?)
java.lang.NoClassDefFoundError: com/palmergames/bukkit/towny/NotRegisteredException
        at net.milkbowl.vault.Vault.loadChat(Vault.java:214)
        at net.milkbowl.vault.Vault.onEnable(Vault.java:109)
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:215)
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:336)
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:383)
        at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:367)
        at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:349)
        at org.bukkit.craftbukkit.CraftServer.<init>(CraftServer.java:291)
        at net.minecraft.server.ServerConfigurationManager.<init>(ServerConfigurationManager.java:53)
        at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:188)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:475)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
Caused by: java.lang.ClassNotFoundException: com.palmergames.bukkit.towny.NotRegisteredException
        at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:41)
        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:29)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
        ... 12 more