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Just got this crash report:

---- Minecraft Crash Report ----
// You're mean.

Time: 6/6/15 10:05 AM
Description: Updating screen events

java.lang.NoClassDefFoundError: Could not initialize class li.cil.oc.util.ItemCosts$
at li.cil.oc.common.item.traits.SimpleItem$class.addInformation(SimpleItem.scala:44)
at li.cil.oc.common.item.HoverBoots.func_77624_a(HoverBoots.scala:15)
at net.minecraft.item.ItemStack.func_82840_a(ItemStack.java:525)
at net.minecraft.client.gui.inventory.GuiContainerCreative.updateFilteredItems(GuiContainerCreative.java:378)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_147053_i(GuiContainerCreative.java:350)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_147050_b(GuiContainerCreative.java:550)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_146286_b(GuiContainerCreative.java:456)
at net.minecraft.client.gui.GuiScreen.func_146274_d(GuiScreen.java:306)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_146274_d(GuiContainerCreative.java:566)
at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:268)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1629)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:962)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:887)
at net.minecraft.client.main.Main.main(SourceFile:148)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

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

-- Head --
Stacktrace:
at li.cil.oc.common.item.traits.SimpleItem$class.addInformation(SimpleItem.scala:44)
at li.cil.oc.common.item.HoverBoots.func_77624_a(HoverBoots.scala:15)
at net.minecraft.item.ItemStack.func_82840_a(ItemStack.java:525)
at net.minecraft.client.gui.inventory.GuiContainerCreative.updateFilteredItems(GuiContainerCreative.java:378)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_147053_i(GuiContainerCreative.java:350)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_147050_b(GuiContainerCreative.java:550)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_146286_b(GuiContainerCreative.java:456)
at net.minecraft.client.gui.GuiScreen.func_146274_d(GuiScreen.java:306)
at net.minecraft.client.gui.inventory.GuiContainerCreative.func_146274_d(GuiContainerCreative.java:566)
at net.minecraft.client.gui.GuiScreen.func_146269_k(GuiScreen.java:268)

-- Affected screen --
Details:
Screen name: net.minecraft.client.gui.inventory.GuiContainerCreative

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['Creeperlmw'/1671, l='MpServer', x=300.26, y=63.62, z=82.60]]
Chunk stats: MultiplayerChunkCache: 220, 229
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (223,64,-108), Chunk: (at 15,4,4 in 13,-7; contains blocks 208,0,-112 to 223,255,-97), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Level time: 11166 game time, 11166 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 29 total; [EntityCreeper['Creeper'/1703, l='MpServer', x=363.50, y=23.00, z=105.50], EntityCreeper['Creeper'/1702, l='MpServer', x=353.50, y=25.00, z=109.50], EntityCreeper['Creeper'/1701, l='MpServer', x=356.78, y=23.00, z=99.78], EntityZombie['Zombie'/1700, l='MpServer', x=360.50, y=14.00, z=106.50], MoCEntityDragonfly['DragonFly'/1578, l='MpServer', x=305.88, y=61.00, z=45.41], EntityCreeper['Creeper'/1577, l='MpServer', x=310.50, y=15.00, z=16.50], EntityClientPlayerMP['Creeperlmw'/1671, l='MpServer', x=300.26, y=63.62, z=82.60], EntityBat['Bat'/1710, l='MpServer', x=379.25, y=24.59, z=132.53], EntityBat['Bat'/1575, l='MpServer', x=279.75, y=12.19, z=43.41], EntitySkeleton['Skeleton'/1709, l='MpServer', x=371.16, y=26.00, z=96.56], EntityBat['Bat'/1707, l='MpServer', x=366.97, y=24.51, z=102.50], EntityCreeper['Creeper'/1570, l='MpServer', x=264.50, y=20.00, z=40.50], EntityZombie['Zombie'/1775, l='MpServer', x=373.91, y=16.00, z=102.34], EntityCreeper['Creeper'/1706, l='MpServer', x=357.50, y=23.00, z=103.59], EntityBat['Bat'/1571, l='MpServer', x=264.25, y=22.10, z=45.25], EntityCreeper['Creeper'/1705, l='MpServer', x=365.50, y=23.00, z=106.50], EntitySkeleton['Skeleton'/1568, l='MpServer', x=261.50, y=16.00, z=22.50], EntityZombie['Zombie'/1569, l='MpServer', x=264.50, y=21.00, z=42.50], EntityCreeper['Creeper'/1704, l='MpServer', x=365.50, y=23.00, z=103.50], EntityEnderman['Enderman'/1776, l='MpServer', x=377.82, y=15.47, z=106.76], EntityCreeper['Creeper'/1777, l='MpServer', x=226.56, y=21.54, z=119.39], EntityBat['Bat'/2054, l='MpServer', x=230.28, y=13.53, z=88.34], EntityBat['Bat'/2055, l='MpServer', x=234.94, y=13.53, z=87.91], EntitySkeleton['Skeleton'/1586, l='MpServer', x=376.50, y=28.00, z=27.50], EntityCreeper['Creeper'/1565, l='MpServer', x=250.06, y=13.00, z=21.59], EntitySkeleton['Skeleton'/1567, l='MpServer', x=250.50, y=26.00, z=58.50], EntityBat['Bat'/1566, l='MpServer', x=249.47, y=14.34, z=25.50], MoCEntityMediumFish['MediumFish'/1561, l='MpServer', x=195.63, y=48.98, z=-10.06], EntityBat['Bat'/1683, l='MpServer', x=231.25, y=20.00, z=151.59]]
Retry entities: 0 total; []
Server brand: fml,forge
Server type: Integrated singleplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:373)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2433)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:908)
at net.minecraft.client.main.Main.main(SourceFile:148)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Mac OS X (x86_64) version 10.6.8
Java Version: 1.6.0_65, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 1341954872 bytes (1279 MB) / 1850609664 bytes (1764 MB) up to 2138767360 bytes (2039 MB)
JVM Flags: 2 total; -Xmx2G -XX:MaxPermSize=128m
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
FML: MCP v9.05 FML v7.10.85.1236 Minecraft Forge 10.13.2.1236 Optifine OptiFine_1.7.10_HD_U_B7 37 mods loaded, 37 mods active
mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{7.10.85.1236} [Forge Mod Loader] (forge-1.7.10-10.13.2.1236.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{10.13.2.1236} [Minecraft Forge] (forge-1.7.10-10.13.2.1236.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CodeChickenCore{1.0.1.8} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
OpenComputers|Core{1.0.0} [OpenComputers (Core)] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
<CoFH ASM>{000} [CoFH ASM] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
SC0_SpaceCore{0.7.14} [SpaceCore] (1.7.10-SpaceCore-0.7.14.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
SC0_Wings{1.2.6} [Survival Wings] (1.7.10-Survival-Wings-1.2.6.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
bspkrsCore{6.15} [bspkrsCore] ([1.7.10]bspkrsCore-universal-6.15.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Treecapitator{1.7.10} [Treecapitator] ([1.7.10]Treecapitator-universal-2.0.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BiblioCraft{1.10.2} [BiblioCraft] (BiblioCraft[v1.10.2][MC1.7.10].jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CarpentersBlocks{3.3.5} [Carpenter's Blocks] (Carpenter's Blocks v3.3.5 - MC 1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CoFHCore{1.7.10R3.0.2} [CoFH Core] (CoFHCore-[1.7.10]3.0.2-262.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Railcraft{9.6.1.0} [Railcraft] (Railcraft_1.7.10-9.6.1.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ForgeMultipart{1.1.0.314} [Forge Multipart] (ForgeMultipart-1.7.10-1.1.0.314-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
chisel{2.3.10.37} [Chisel 2] (Chisel2-2.3.10.37.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ComputerCraft{1.73} [ComputerCraft] (ComputerCraft1.73.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CustomSpawner{3.2.0} [DrZhark's CustomSpawner] (CustomMobSpawner 3) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
customnpcs{1.7.10} [CustomNpcs] (CustomNPCs_1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MoCreatures{6.3.1} [DrZhark's Mo'Creatures Mod] (DrZharks MoCreatures Mod v6-1) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ThermalFoundation{1.7.10R1.0.0} [Thermal Foundation] (ThermalFoundation-[1.7.10]1.0.0-81.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ThermalExpansion{1.7.10R4.0.1} [Thermal Expansion] (ThermalExpansion-[1-1.7.10]4.0.1-182.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
enhancedportals{3.0.10} [EnhancedPortals] (EnhancedPortals_1.7.10-universal-3.0.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
HopperDuctMod{1.3.2} [Hopper Ducts] (hopperductmod-1.7.10-1.3.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
IronChest{6.0.62.742} [Iron Chest] (ironchest-1.7.10-6.0.62.742-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
JABBA{1.1.4} [JABBA] (Jabba-1.1.4_1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
magicalcrops{1.7.2 - 0.1 ALPHA} [Magical Crops] (magicalcrops-1.7.10_0.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Mantle{1.7.10-0.3.2.jenkins184} [Mantle] (Mantle-1.7.10-0.3.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Natura{2.2.0} [Natura] (natura-1.7.10-2.2.0.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
OpenComputers{1.5.12.26} [OpenComputers] (OpenComputers-MC1.7.10-1.5.12.26-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
harvestcraft{1.7.10g} [Pam's HarvestCraft] (Pam's HarvestCraft 1.7.10h.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
progressiveautomation{1.6.16} [Progressive Automation] (ProgressiveAutomation-1.7.10-1.6.16.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
witchery{0.20.0} [Witchery] (witchery-1.7.10-0.20.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
worldedit{6.0-beta-01} [WorldEdit] (worldedit-forge-mc1.7.10-6.0-beta-01.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Baubles{1.0.1.10} [Baubles] (Baubles-1.7.10-1.0.1.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
McMultipart{1.1.0.314} [Minecraft Multipart Plugin] (ForgeMultipart-1.7.10-1.1.0.314-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ForgeMicroblock{1.1.0.314} [Forge Microblocks] (ForgeMultipart-1.7.10-1.1.0.314-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CoFHCore: -[1.7.10]3.0.2-262
ThermalFoundation: -[1.7.10]1.0.0-81
ThermalExpansion: -[1.7.10]4.0.1-182
Mantle Environment: DO NOT REPORT THIS CRASH! Unsupported mods in environment: optifine
Launched Version: 1.7.10-Forge10.13.2.1236
LWJGL: 2.9.1
OpenGL: NVIDIA GeForce GT 330M OpenGL Engine GL version 2.1 NVIDIA-1.6.40, NVIDIA Corporation
GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because ARB_framebuffer_object is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Packs: [faithful32pack]
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Anisotropic Filtering: Off (1)

It happened when I went into creative and clicked on the "search" in the creative inventory.

Please help!