[SEVERE] Error occurred while enabling PreciousStones v8.0.1 (Is it up to date?): org.bukkit.plugin.PluginManager.registerEvents(Lorg/bukkit/event/Listener;Lorg/bukkit/plugin/Plugin;)V
java.lang.NoSuchMethodError: org.bukkit.plugin.PluginManager.registerEvents(Lorg/bukkit/event/Listener;Lorg/bukkit/plugin/Plugin;)V
at net.sacredlabyrinth.Phaed.PreciousStones.PreciousStones.registerEvents(PreciousStones.java:148)
at net.sacredlabyrinth.Phaed.PreciousStones.PreciousStones.onEnable(PreciousStones.java:137)
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:230)
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:989)
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:280)
at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:190)
at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:173)
at net.minecraft.server.MinecraftServer.t(MinecraftServer.java:356)
at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:343)
at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:175)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:407)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:465)

What to do, what to do ?

If you run a plugin with an outdated CB version things like this happen.

Upgrade:
http://forums.bukkit.org/threads/recommended-build-1-1-r3.57480/