The slot machines were setup in 2.2.5 and I am not sure if it broke when I updated or after the update, but below is the error I get when the server starts up. After startup nothing appears to be loaded and the machines do not work.

2012-05-15 06:54:10 [INFO] [CasinoSlots] Enabling CasinoSlots v2.3.0
2012-05-15 06:54:10 [SEVERE] Error occurred while enabling CasinoSlots v2.3.0 (Is it up to date?)
java.lang.NullPointerException
at org.bukkit.Location.getBlock(Location.java:82)
at com.craftyn.casinoslots.slot.SlotData.getBlocks(SlotData.java:147)
at com.craftyn.casinoslots.slot.SlotData.loadSlot(SlotData.java:130)
at com.craftyn.casinoslots.slot.SlotData.loadSlots(SlotData.java:80)
at com.craftyn.casinoslots.util.ConfigData.load(ConfigData.java:53)
at com.craftyn.casinoslots.CasinoSlots.onEnable(CasinoSlots.java:75)
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:381)
at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:250)
at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:232)
at net.minecraft.server.MinecraftServer.t(MinecraftServer.java:371)
at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:358)
at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:187)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:422)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

Added an error message and disables the plugin now. Thanks for reporting this.

I am now in 2.3.1 and this was the load error:

2012-05-15 20:13:57 [INFO] [CasinoSlots] Enabling CasinoSlots v2.3.1
2012-05-15 20:13:57 [SEVERE] Error occurred while enabling CasinoSlots v2.3.1 (Is it up to date?)
java.lang.NullPointerException
at org.bukkit.Location.getBlock(Location.java:82)
at com.craftyn.casinoslots.slot.SlotData.getBlocks(SlotData.java:147)
at com.craftyn.casinoslots.slot.SlotData.loadSlot(SlotData.java:130)
at com.craftyn.casinoslots.slot.SlotData.loadSlots(SlotData.java:80)
at com.craftyn.casinoslots.util.ConfigData.load(ConfigData.java:53)
at com.craftyn.casinoslots.CasinoSlots.onEnable(CasinoSlots.java:75)
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:381)
at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:250)
at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:232)
at net.minecraft.server.MinecraftServer.t(MinecraftServer.java:371)
at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:358)
at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:187)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:422)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)