casino slot error init

2013-11-06 11:18:28 [INFO] [CasinoSlots] Enabling CasinoSlots v2.5.5-b156
2013-11-06 11:18:28 [INFO] [CasinoSlots] Loaded 2 types.
2013-11-06 11:18:28 [WARNING] [CasinoSlots] The world for the slot 'maquina1' was null, please fix this and restart the server.
2013-11-06 11:18:28 [INFO] [CasinoSlots] Disabling CasinoSlots v2.5.5-b156
2013-11-06 11:18:28 [SEVERE] Error occurred while enabling CasinoSlots v2.5.5-b156 (Is it up to date?)
java.lang.NullPointerException
	at com.craftyn.casinoslots.slot.SlotData.getController(SlotData.java:198)
	at com.craftyn.casinoslots.slot.SlotData.loadSlot(SlotData.java:159)
	at com.craftyn.casinoslots.slot.SlotData.loadSlots(SlotData.java:98)
	at com.craftyn.casinoslots.util.ConfigData.load(ConfigData.java:56)
	at com.craftyn.casinoslots.CasinoSlots.onEnable(CasinoSlots.java:89)
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:457)
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381)
	at org.bukkit.craftbukkit.v1_6_R2.CraftServer.loadPlugin(CraftServer.java:282)
	at org.bukkit.craftbukkit.v1_6_R2.CraftServer.enablePlugins(CraftServer.java:264)
	at net.minecraft.server.v1_6_R2.MinecraftServer.l(MinecraftServer.java:313)
	at net.minecraft.server.v1_6_R2.MinecraftServer.f(MinecraftServer.java:290)
	at net.minecraft.server.v1_6_R2.MinecraftServer.a(MinecraftServer.java:250)
	at net.minecraft.server.v1_6_R2.DedicatedServer.init(DedicatedServer.java:151)
	at net.minecraft.server.v1_6_R2.MinecraftServer.run(MinecraftServer.java:391)
	at net.minecraft.server.v1_6_R2.ThreadServerApplication.run(SourceFile:582)