SparkTrail Error

2013-07-11 06:13:03 [SEVERE] Error occurred while enabling SparkTrail v2.7.2 (Is it up to date?)
java.lang.NoClassDefFoundError: net/minecraft/server/v1_6_R1/Packet
	at me.dsh105.sparktrail.SparkPlayer.playerSparkle(SparkPlayer.java:3078)
	at me.dsh105.sparktrail.SparkPlayer.<init>(SparkPlayer.java:60)
	at me.dsh105.sparktrail.SparkTrail.onEnable(SparkTrail.java:67)
	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:382)
	at org.bukkit.craftbukkit.v1_6_R2.CraftServer.loadPlugin(CraftServer.java:286)
	at org.bukkit.craftbukkit.v1_6_R2.CraftServer.enablePlugins(CraftServer.java:268)
	at net.minecraft.server.v1_6_R2.MinecraftServer.l(MinecraftServer.java:319)
	at net.minecraft.server.v1_6_R2.MinecraftServer.f(MinecraftServer.java:296)
	at net.minecraft.server.v1_6_R2.MinecraftServer.a(MinecraftServer.java:256)
	at net.minecraft.server.v1_6_R2.DedicatedServer.init(DedicatedServer.java:164)
	at net.minecraft.server.v1_6_R2.MinecraftServer.run(MinecraftServer.java:397)
	at net.minecraft.server.v1_6_R2.ThreadServerApplication.run(SourceFile:582)
Caused by: java.lang.ClassNotFoundException: net.minecraft.server.v1_6_R1.Packet
	at org.bukkit.plugin.java.PluginClassLoader.findClass0(PluginClassLoader.java:70)
	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)
	... 14 more