umbwithplotsquared

[04:33:36] [Server thread/ERROR]: Error occurred while enabling Umbaska v2.0 Beta 5.5.1 (Is it up to date?)
java.lang.NoClassDefFoundError: com/plotsquared/bukkit/events/PlayerEnterPlotEvent
	at uk.co.umbaska.Managers.Register.registerAll(Register.java:141) ~[?:?]
	at uk.co.umbaska.Main.doThis(Main.java:414) ~[?:?]
	at uk.co.umbaska.Main.onEnable(Main.java:146) ~[?:?]
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:321) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:340) [spigot.jar:git-Spigot-db6de12-18fbb24]
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:405) [spigot.jar:git-Spigot-db6de12-18fbb24]
	at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugin(CraftServer.java:357) [spigot.jar:git-Spigot-db6de12-18fbb24]
	at org.bukkit.craftbukkit.v1_8_R3.CraftServer.enablePlugins(CraftServer.java:317) [spigot.jar:git-Spigot-db6de12-18fbb24]
	at net.minecraft.server.v1_8_R3.MinecraftServer.s(MinecraftServer.java:414) [spigot.jar:git-Spigot-db6de12-18fbb24]
	at net.minecraft.server.v1_8_R3.MinecraftServer.k(MinecraftServer.java:378) [spigot.jar:git-Spigot-db6de12-18fbb24]
	at net.minecraft.server.v1_8_R3.MinecraftServer.a(MinecraftServer.java:333) [spigot.jar:git-Spigot-db6de12-18fbb24]
	at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:263) [spigot.jar:git-Spigot-db6de12-18fbb24]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:525) [spigot.jar:git-Spigot-db6de12-18fbb24]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_66]
Caused by: java.lang.ClassNotFoundException: com.plotsquared.bukkit.events.PlayerEnterPlotEvent
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[?:1.8.0_66]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:101) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:86) ~[spigot.jar:git-Spigot-db6de12-18fbb24]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_66]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_66]
	... 14 more