Bukkit

What version of the product are you using?
I try all this version:
B: CustomSpawners v0.3.3 for CB 1.5.1-R0.2 Apr 14, 2013
B: CustomSpawners v0.3.2.1 for CB 1.5.1-R0.1 Apr 11, 2013
B: CustomSpawners v0.3.2 for CB 1.5.1-R0.1 Apr 09, 2013
B: CustomSpawners v0.3.1 for 1.5.1 Mar 24, 2013

My serveur version:
CraftBukkit 1.5.1-R0.1 Beta-build

Do you have an error log of what happened?

00:50:36 [WARNING] [CustomSpawners] Task #27175 for CustomSpawners v0.3.3 generated an exception java.lang.ClassCastException: java.lang.Integer cannot be cast to java.util.UUID at com.github.thebiologist13.CustomSpawners$2.run(CustomSpawners.java:1030) at org.bukkit.craftbukkit.v1_5_R2.scheduler.CraftTask.run(CraftTask.java:53) at org.bukkit.craftbukkit.v1_5_R2.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:345) at net.minecraft.server.v1_5_R2.MinecraftServer.r(MinecraftServer.java:512) at net.minecraft.server.v1_5_R2.DedicatedServer.r(DedicatedServer.java:225) at net.minecraft.server.v1_5_R2.MinecraftServer.q(MinecraftServer.java:476) at net.minecraft.server.v1_5_R2.MinecraftServer.run(MinecraftServer.java:409) at net.minecraft.server.v1_5_R2.ThreadServerApplication.run(SourceFile:573)

Please provide any additional information below.
On 1.4.7, the plugin was working, but now the plugin make an error and spam my logs, so i want to be work your greate plugin on 1.5.1 on my server (i've keep all files then i had in 1.4.7). No error in the file crash ...