Runic dungeon crash.

Time: 3/5/15 4:29 PM
Description: Exception in server tick loop

java.lang.NoClassDefFoundError: net/minecraft/client/resources/IResourceManager
	at mrcomputerghost.runicdungeons.blocks.BlockRunicCircle.func_149749_a(BlockRunicCircle.java:69)
	at net.minecraft.world.chunk.Chunk.func_150807_a(Chunk.java:625)
	at net.minecraft.world.World.func_147465_d(World.java:793)
	at net.minecraft.world.World.func_147468_f(World.java:927)
	at net.minecraft.block.Block.removedByPlayer(Block.java:1359)
	at net.minecraft.block.Block.removedByPlayer(Block.java:1353)
	at net.minecraft.server.management.ItemInWorldManager.removeBlock(ItemInWorldManager.java:303)
	at net.minecraft.server.management.ItemInWorldManager.func_73084_b(ItemInWorldManager.java:358)
	at net.minecraft.server.management.ItemInWorldManager.func_73074_a(ItemInWorldManager.java:242)
	at net.minecraft.network.NetHandlerPlayServer.func_147345_a(NetHandlerPlayServer.java:749)
	at net.minecraft.network.play.client.C07PacketPlayerDigging.func_148833_a(SourceFile:53)
	at net.minecraft.network.play.client.C07PacketPlayerDigging.func_148833_a(SourceFile:8)
	at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:244)
	at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:173)
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:980)
	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:423)
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:798)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:658)
	at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.resources.IResourceManager
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
	... 19 more
Caused by: java.lang.NullPointerException