Scoreboard-Stats Error

java.lang.ClassNotFoundException: com.github.games647.scoreboardstats.compatibility.Craftv1_6_R3
	at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
	at org.bukkit.plugin.java.PluginClassLoader.findClass0(PluginClassLoader.java:80)
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:53)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:186)
	at com.github.games647.scoreboardstats.scoreboard.ReflectionUtil.setupClass(ReflectionUtil.java:39)
	at com.github.games647.scoreboardstats.scoreboard.ReflectionUtil.<clinit>(ReflectionUtil.java:34)
	at com.github.games647.scoreboardstats.ScoreboardStats.onLoad(ScoreboardStats.java:106)
	at org.bukkit.craftbukkit.v1_6_R3.CraftServer.loadPlugins(CraftServer.java:246)
	at org.bukkit.craftbukkit.v1_6_R3.CraftServer.<init>(CraftServer.java:219)
	at net.minecraft.server.v1_6_R3.PlayerList.<init>(PlayerList.java:56)
	at net.minecraft.server.v1_6_R3.DedicatedPlayerList.<init>(SourceFile:11)
	at net.minecraft.server.v1_6_R3.DedicatedServer.init(DedicatedServer.java:107)
	at net.minecraft.server.v1_6_R3.MinecraftServer.run(MinecraftServer.java:393)
	at net.minecraft.server.v1_6_R3.ThreadServerApplication.run(SourceFile:583)
2013-10-25 18:22:57 [INFO] [ScoreboardStats] The Plugin isn't compatible with your craftbukkit version. It will now try to use Reflections