RecipeManager Error

2013-05-25 18:26:39 [FINE] [RecipeManager] Loading settings and recipes...
2013-05-25 18:26:39 [WARNING] [RecipeManager] Task #30 for RecipeManager v1.26b generated an exception
java.lang.NoClassDefFoundError: net/minecraft/server/Item
	at digi.recipeManager.RecipeManager.loadSettings(RecipeManager.java:278)
	at digi.recipeManager.RecipeManager$1.run(RecipeManager.java:82)
	at org.bukkit.craftbukkit.v1_5_R3.scheduler.CraftTask.run(CraftTask.java:53)
	at org.bukkit.craftbukkit.v1_5_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:345)
	at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:513)
	at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:226)
	at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:477)
	at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:410)
	at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)