Error occurred while enabling PreciousStones v9.5.4 (Is it up to date?)
java.lang.NullPointerException
at net.sacredlabyrinth.Phaed.PreciousStones.ChatBlock.format(ChatBlock.java:938)
at net.sacredlabyrinth.Phaed.PreciousStones.PreciousStones.log(PreciousStones.java:99)
at net.sacredlabyrinth.Phaed.PreciousStones.FieldSettings.loadIntList(FieldSettings.java:610)
at net.sacredlabyrinth.Phaed.PreciousStones.FieldSettings.parseSettings(FieldSettings.java:347)
at net.sacredlabyrinth.Phaed.PreciousStones.FieldSettings.(FieldSettings.java:112)
at net.sacredlabyrinth.Phaed.PreciousStones.managers.SettingsManager.addForceFieldStones(SettingsManager.java:414)
at net.sacredlabyrinth.Phaed.PreciousStones.managers.SettingsManager.load(SettingsManager.java:303)
at net.sacredlabyrinth.Phaed.PreciousStones.managers.SettingsManager.(SettingsManager.java:144)
at net.sacredlabyrinth.Phaed.PreciousStones.PreciousStones.onEnable(PreciousStones.java:119)
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_4_6.CraftServer.loadPlugin(CraftServer.java:282)
at org.bukkit.craftbukkit.v1_4_6.CraftServer.enablePlugins(CraftServer.java:264)
at net.minecraft.server.v1_4_6.MinecraftServer.j(MinecraftServer.java:321)
at net.minecraft.server.v1_4_6.MinecraftServer.e(MinecraftServer.java:300)
at net.minecraft.server.v1_4_6.MinecraftServer.a(MinecraftServer.java:259)
at net.minecraft.server.v1_4_6.DedicatedServer.init(DedicatedServer.java:149)
at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:399)
at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:849)

not sure why this happens :( using latest beta bukkit , not the broken one

Try the latest versions on jenkins, this bug shoudl be fixed.