Mass issue here!

2013-06-05 21:21:26 [WARNING] [Ablockalypse] Task #1564 for Ablockalypse v1.2.9 generated an exception
java.lang.NoClassDefFoundError: net/minecraft/server/v1_5_R2/Entity
at com.github.jamesnorris.implementation.Undead.(Undead.java:44)
at com.github.jamesnorris.enumerated.GameEntityType$2.instantiate(GameEntityType.java:25)
at com.github.jamesnorris.manager.SpawnManager.gameSpawn(SpawnManager.java:82)
at com.github.jamesnorris.manager.SpawnManager.spawn(SpawnManager.java:250)
at com.github.jamesnorris.implementation.Game.spawn(Game.java:669)
at com.github.jamesnorris.threading.MobSpawningThread.run(MobSpawningThread.java:33)
at com.github.jamesnorris.threading.MainThread.tick(MainThread.java:45)
at com.github.jamesnorris.threading.MainThread$1.run(MainThread.java:23)
at org.bukkit.craftbukkit.v1_5_R3.scheduler.CraftTask.run(CraftTask.java:67)
at org.bukkit.craftbukkit.v1_5_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:344)
at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:509)
at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:227)
at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:472)
at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:404)
at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.ClassNotFoundException: net.minecraft.server.v1_5_R2.Entity
at org.bukkit.plugin.java.PluginClassLoader.findClass0(PluginClassLoader.java:70)
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:53)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
... 15 more

As well as the occasional #26, but having to do with a spawn issue with the mobs.

Help is much appreciated!

Are you using the latest version of CraftBukkit? If so, this is the problem. Currently due to the Bukkit versioning policy, I have to update when they change to a new version. It seems you are running 1.5 R3, where this version of Ablockalypse is 1.5 R2. Just wait for the Beta, I will have it done in a little while.

This most likely also relates to your other issue.