WD Crash

2013-12-12 11:12:11 [SEVERE] [ForgeModLoader] A critical server error occured handling a packet, kicking 147
net.minecraft.util.ReportedException: Ticking player
	at net.minecraft.entity.player.EntityPlayerMP.localOnUpdateEntity(EntityPlayerMP.java:377)
	at api.player.server.ServerPlayerAPI.onUpdateEntity(ServerPlayerAPI.java:4540)
	at net.minecraft.entity.player.EntityPlayerMP.func_71127_g(EntityPlayerMP.java)
	at net.minecraft.network.NetServerHandler.func_72498_a(NetServerHandler.java:304)
	at net.smart.moving.playerapi.NetServerHandler.func_72498_a(NetServerHandler.java:24)
	at net.minecraft.network.packet.Packet10Flying.func_73279_a(SourceFile:136)
	at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:462)
	at net.minecraft.network.NetServerHandler.func_72570_d(NetServerHandler.java:141)
	at net.minecraft.network.NetworkListenThread.func_71747_b(NetworkListenThread.java:54)
	at net.minecraft.server.dedicated.DedicatedServerListenThread.func_71747_b(SourceFile:30)
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:691)
	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:276)
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:587)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484)
	at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)
Caused by: java.lang.NoClassDefFoundError: net/minecraft/client/entity/EntityPlayerSP
	at gregtechmod.common.GT_TickHandler.tickEnd(GT_TickHandler.java:95)
	at cpw.mods.fml.common.SingleIntervalHandler.tickEnd(SingleIntervalHandler.java:34)
	at cpw.mods.fml.common.FMLCommonHandler.tickEnd(FMLCommonHandler.java:141)
	at cpw.mods.fml.common.FMLCommonHandler.onPlayerPostTick(FMLCommonHandler.java:389)
	at net.minecraft.entity.player.EntityPlayer.func_70071_h_(EntityPlayer.java:407)
	at net.minecraft.entity.player.EntityPlayerMP.localOnUpdateEntity(EntityPlayerMP.java:328)
	... 14 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.entity.EntityPlayerSP
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:186)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	... 20 more
Caused by: java.lang.RuntimeException: Attempted to load class bex for invalid side SERVER
	at cpw.mods.fml.common.asm.transformers.SideTransformer.transform(SideTransformer.java:50)
	at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:274)
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:172)
	... 22 more
2013-12-12 11:12:11 [WARNING] [Minecraft-Server] Failed to handle packet for Vistaern/127.0.0.1: net.minecraft.util.ReportedException: Ticking player
net.minecraft.util.ReportedException: Ticking player
	at net.minecraft.entity.player.EntityPlayerMP.localOnUpdateEntity(EntityPlayerMP.java:377)
	at api.player.server.ServerPlayerAPI.onUpdateEntity(ServerPlayerAPI.java:4540)
	at net.minecraft.entity.player.EntityPlayerMP.func_71127_g(EntityPlayerMP.java)
	at net.minecraft.network.NetServerHandler.func_72498_a(NetServerHandler.java:304)
	at net.smart.moving.playerapi.NetServerHandler.func_72498_a(NetServerHandler.java:24)
	at net.minecraft.network.packet.Packet10Flying.func_73279_a(SourceFile:136)
	at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:462)
	at net.minecraft.network.NetServerHandler.func_72570_d(NetServerHandler.java:141)
	at net.minecraft.network.NetworkListenThread.func_71747_b(NetworkListenThread.java:54)
	at net.minecraft.server.dedicated.DedicatedServerListenThread.func_71747_b(SourceFile:30)
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:691)
	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:276)
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:587)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:484)
	at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)
Caused by: java.lang.NoClassDefFoundError: net/minecraft/client/entity/EntityPlayerSP
	at gregtechmod.common.GT_TickHandler.tickEnd(GT_TickHandler.java:95)
	at cpw.mods.fml.common.SingleIntervalHandler.tickEnd(SingleIntervalHandler.java:34)
	at cpw.mods.fml.common.FMLCommonHandler.tickEnd(FMLCommonHandler.java:141)
	at cpw.mods.fml.common.FMLCommonHandler.onPlayerPostTick(FMLCommonHandler.java:389)
	at net.minecraft.entity.player.EntityPlayer.func_70071_h_(EntityPlayer.java:407)
	at net.minecraft.entity.player.EntityPlayerMP.localOnUpdateEntity(EntityPlayerMP.java:328)
	... 14 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.entity.EntityPlayerSP
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:186)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	... 20 more
Caused by: java.lang.RuntimeException: Attempted to load class bex for invalid side SERVER
	at cpw.mods.fml.common.asm.transformers.SideTransformer.transform(SideTransformer.java:50)
	at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:274)
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:172)
	... 22 more
2013-12-12 11:12:11 [INFO] [Minecraft-Server] Vistaern left the game