Sign Utilities Crash

2013-02-25 20:27:20 [INFO] This server is running CraftBukkit version git-Bukkit-1.4.7-R1.0-b2624jnks (MC: 1.4.7) (Implementing API version 1.4.7-R1.0)

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2013-02-25 20:29:30 [INFO] [SignUtilities] Enabling SignUtilities v1.15.0b
2013-02-25 20:29:30 [SEVERE] [SignUtilities] - Disabled due to no economy plugin found!
2013-02-25 20:29:30 [INFO] [SignUtilities] Disabling SignUtilities v1.15.0b
2013-02-25 20:29:30 [SEVERE] Error occurred while enabling SignUtilities v1.15.0b (Is it up to date?)
org.bukkit.plugin.IllegalPluginAccessException: Plugin attempted to register com.timcolonel.SignUtilities.Listeners.SUBlockListener@330d4ed2 while not enabled
	at org.bukkit.plugin.SimplePluginManager.registerEvents(SimplePluginManager.java:499)
	at com.timcolonel.SignUtilities.SignUtilities.onEnable(SignUtilities.java:106)
	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_R1.CraftServer.loadPlugin(CraftServer.java:282)
	at org.bukkit.craftbukkit.v1_4_R1.CraftServer.enablePlugins(CraftServer.java:264)
	at net.minecraft.server.v1_4_R1.MinecraftServer.j(MinecraftServer.java:321)
	at net.minecraft.server.v1_4_R1.MinecraftServer.e(MinecraftServer.java:300)
	at net.minecraft.server.v1_4_R1.MinecraftServer.a(MinecraftServer.java:259)
	at net.minecraft.server.v1_4_R1.DedicatedServer.init(DedicatedServer.java:149)
	at net.minecraft.server.v1_4_R1.MinecraftServer.run(MinecraftServer.java:399)
	at net.minecraft.server.v1_4_R1.ThreadServerApplication.run(SourceFile:849)