TConstruct, Mantle, Mechworks Crash

---- Minecraft Crash Report ----
// Don't be sad. I'll do better next time, I promise!

Time: 2/22/14 2:18 PM
Description: Exception in server tick loop

cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: net/minecraft/client/gui/GuiScreen
	at cpw.mods.fml.common.LoadController.transition(LoadController.java:163)
	at cpw.mods.fml.common.Loader.loadMods(Loader.java:497)
	at cpw.mods.fml.server.FMLServerHandler.beginServerLoading(FMLServerHandler.java:78)
	at cpw.mods.fml.common.FMLCommonHandler.onServerStart(FMLCommonHandler.java:296)
	at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:115)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:414)
	at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:706)
Caused by: java.lang.NoClassDefFoundError: net/minecraft/client/gui/GuiScreen
	at tconstruct.common.TContent.registerItems(TContent.java:566)
	at tconstruct.common.TContent.<init>(TContent.java:146)
	at tconstruct.TConstruct.preInit(TConstruct.java:118)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:536)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)
	at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:47)
	at com.google.common.eventbus.EventBus.dispatch(EventBus.java:314)
	at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
	at com.google.common.eventbus.EventBus.post(EventBus.java:267)
	at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:209)
	at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:188)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:74)
	at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:47)
	at com.google.common.eventbus.EventBus.dispatch(EventBus.java:314)
	at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
	at com.google.common.eventbus.EventBus.post(EventBus.java:267)
	at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:119)
	at cpw.mods.fml.common.Loader.loadMods(Loader.java:495)
	... 5 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.gui.GuiScreen
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:188)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	... 35 more
Caused by: java.lang.RuntimeException: Attempted to load class bcd for invalid side SERVER
	at cpw.mods.fml.common.asm.transformers.SideTransformer.transform(SideTransformer.java:50)
	at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:276)
	at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:174)
	... 37 more


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- System Details --
Details:
	Minecraft Version: 1.7.2
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_51, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 1704185512 bytes (1625 MB) / 2058878976 bytes (1963 MB) up to 2058878976 bytes (1963 MB)
	JVM Flags: 2 total; -Xmx2048M -Xms2048M
	AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	FML: MCP v9.01-pre FML v7.2.125.1033 Minecraft Forge 10.12.0.1033 7 mods loaded, 7 mods active
	mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized
	FML{7.2.125.1033} [Forge Mod Loader] (forge-1.7.2-10.12.0.1033-universal.jar) Unloaded->Constructed->Pre-initialized
	Forge{10.12.0.1033} [Minecraft Forge] (forge-1.7.2-10.12.0.1033-universal.jar) Unloaded->Constructed->Pre-initialized
	TConstruct-Preloader{0.1.1} [Tinkers Corestruct] (minecraft.jar) Unloaded->Constructed->Pre-initialized
	Mantle{1.7.2-107.e63e813} [Mantle] (Mantle_mc1.7.2_0.2.jar) Unloaded->Constructed->Pre-initialized
	TConstruct{1.7.2-371.9874908} [Tinkers' Construct] (TConstruct_mc1.7.2_1.6.0a4.jar) Unloaded->Constructed->Errored
	TMechworks{1.7.2-44.9b693cd} [Tinkers' Mechworks] (Mechworks_mc1.7.2_0.1.5.jar) Unloaded->Constructed->Errored
	TConstruct Environment: Environment healthy.
	Mantle Environment: Environment healthy.
	Profiler Position: N/A (disabled)
	Is Modded: Definitely; Server brand changed to 'fml,forge'
	Type: Dedicated Server (map_server.txt)