java.lang.NosuchMethodException

Updating from snapshot 14w33b to Prerelease 1 causes recurring console errors

Possible causes: Witherskulls

java.lang.NoSuchMethodException: ahu.<init>(aqs)
		at java.lang.Class.getConstructor0(Unknown Source)
		at java.lang.Class.getConstructor(Unknown Source)
		at xb.a(SourceFile: 175)
		at bfw.a(SourceFile:330)
		at bfw.a(SourceFile:95)
		at bfw.a(SourceFile:83)
		at qs.e(SourceFile:129)
		at qs.c(SourceFile:81)
		at net.minecraft.server.MinecraftServer.k(SourceFile:315)
		at net.minecraft.server.MinecraftServer.a(SourceFile:286)
		at po.i(SourceFile:210)
		at net.minecraft.server.MinecraftServer.run(SourceFile:417)
		at java.lang.Thread.run(Unknown Source)