---- Minecraft Crash Report ----
// Oops.

Time: 12/16/12 6:27 PM
Description: Exception in server tick loop

java.lang.NoClassDefFoundError: net/minecraft/client/Minecraft
	at xpbooks.common.ServerPacketHandler.handleExpBookGuiButtonPressed(ServerPacketHandler.java:74)
	at xpbooks.common.ServerPacketHandler.onPacketData(ServerPacketHandler.java:63)
	at cpw.mods.fml.common.network.NetworkRegistry.handlePacket(NetworkRegistry.java:249)
	at cpw.mods.fml.common.network.NetworkRegistry.handleCustomPacket(NetworkRegistry.java:239)
	at cpw.mods.fml.common.network.FMLNetworkHandler.handlePacket250Packet(FMLNetworkHandler.java:78)
	at iv.a(NetServerHandler.java:1054)
	at dj.a(SourceFile:59)
	at cg.b(TcpConnection.java:451)
	at iv.d(NetServerHandler.java:82)
	at iw.b(NetworkListenThread.java:55)
	at ht.b(SourceFile:30)
	at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:696)
	at ho.r(DedicatedServer.java:252)
	at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:592)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:499)
	at fy.run(SourceFile:856)
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.Minecraft
	at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:141)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	... 16 more
Caused by: java.lang.RuntimeException: Attempted to load class net/minecraft/client/Minecraft for invalid side SERVER
	at cpw.mods.fml.common.asm.transformers.SideTransformer.transform(SideTransformer.java:38)
	at cpw.mods.fml.relauncher.RelaunchClassLoader.runTransformers(RelaunchClassLoader.java:178)
	at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:133)
	... 18 more


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

-- System Details --
Details:
	Minecraft Version: 1.4.5
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_07, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 152756032 bytes (145 MB) / 228589568 bytes (218 MB) up to 1901461504 bytes (1813 MB)
	JVM Flags: 0 total;
	AABB Pool Size: 7289 (408184 bytes; 0 MB) allocated, 6444 (360864 bytes; 0 MB) used
	Suspicious classes: FML and Forge are installed
	IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
	FML: MCP v7.23 FML v4.5.17.479 Minecraft Forge 6.4.1.426 10 mods loaded, 10 mods active
	mcp [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
	FML [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
	Forge [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
	CustomSpawner [DrZhark's CustomSpawner] (CustomMobSpawner 1.9.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
	MoCreatures [DrZhark's Mo'Creatures Mod] (DrZharks MoCreatures Mod v4.3.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
	Lepko-EasyCrafting [Easy Crafting] (EasyCrafting-1.1.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
	IronChest [Iron Chest] (ironchest-universal-4.4.0.194.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
	mod_TreeFeller [TreeFeller] (mod_TreeFeller_v1.9.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
	PortalGun [Portal Gun] (portalgun1.4.4v0_universal.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
	XPBooks [XPBooks] (XPBooks-v1.3.1-1.4.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 2778 (155568 bytes; 0 MB) allocated, 2560 (143360 bytes; 0 MB) used
	Player Count: 1 / 20; [iq['MageOfLink'/161, l='world', x=139.74, y=66.00, z=-537.65]]
	Is Modded: Definitely; Server brand changed to 'forge,fml'
	Type: Dedicated Server (map_server.txt)