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I use Forge for my mods, and each time, no matter which profile or world I use, it freezes at "Loading World" and stays that way for a couple minutes before crashing. Here's the report:

---- Minecraft Crash Report ----
// Daisy, daisy...

Time: 8/8/15 3:25 PM
Description: Exception in server tick loop

java.lang.NoClassDefFoundError: scala/collection/mutable/HashSet
at scala.collection.mutable.HashSet$.empty(HashSet.scala:107)
at scala.collection.mutable.HashSet$.empty(HashSet.scala:105)
at scala.collection.generic.GenericCompanion.apply(GenericCompanion.scala:46)
at codechicken.multipart.TickScheduler$WorldTickScheduler.<init>(TickScheduler.scala:37)
at codechicken.multipart.TickScheduler$.createWorldExtension(TickScheduler.scala:131)
at codechicken.lib.world.WorldExtensionManager.onWorldLoad(WorldExtensionManager.java:163)
at codechicken.lib.world.WorldExtensionManager.access$100(WorldExtensionManager.java:22)
at codechicken.lib.world.WorldExtensionManager$WorldExtensionEventHandler.onWorldLoad(WorldExtensionManager.java:85)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_538_WorldExtensionEventHandler_onWorldLoad_Load.invoke(.dynamic)
at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:138)
at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:73)
at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:92)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:387)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)

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

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 242003152 bytes (230 MB) / 1742209024 bytes (1661 MB) up to 3817865216 bytes (3641 MB)
JVM Flags: 4 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx4096m -Xms256m -XX:PermSize=256m
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 v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1492 66 mods loaded, 66 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJAA mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)
UCHIJAA FML{7.10.99.99} [Forge Mod Loader] (forge-1.7.10-10.13.4.1492-1.7.10.jar)
UCHIJAA Forge{10.13.4.1492} [Minecraft Forge] (forge-1.7.10-10.13.4.1492-1.7.10.jar)
UCHIJAA appliedenergistics2-core{rv2-stable-10} [AppliedEnergistics2 Core] (minecraft.jar)
UCHIJAA Aroma1997Core{1.0.2.14} [Aroma1997Core] (Aroma1997Core-1.7.10-1.0.2.14.jar)
UCHIJAA CodeChickenCore{1.0.6.43} [CodeChicken Core] (minecraft.jar)
UCHIJAA NotEnoughItems{1.0.4.107} [Not Enough Items] (NotEnoughItems-1.7.10-1.0.4.107-universal.jar)
UCHIJAA OpenModsCore{0.7.3} [OpenModsCore] (minecraft.jar)
UCHIJAA <CoFH ASM>{000} [CoFH ASM] (minecraft.jar)
UCHIJAA bspkrsCore{6.16} [bspkrsCore] ([1.7.10]bspkrsCore-universal-6.16.jar)
UCHIJAA Treecapitator{1.7.10} [Treecapitator] ([1.7.10]Treecapitator-universal-2.0.4.jar)
UCHIJAA appliedenergistics2{rv2-stable-10} [Applied Energistics 2] (appliedenergistics2-rv2-stable-10.jar)
UCHIJAA Aroma1997CoreHelper{1.0.2.14} [Aroma1997Core|Helper] (Aroma1997Core-1.7.10-1.0.2.14.jar)
UCHIJAA AromaBackup{0.0.0.5} [AromaBackup] (AromaBackup-1.7.10-0.0.0.5.jar)
UCHIJAA BiblioCraft{1.10.5} [BiblioCraft] (BiblioCraft[v1.10.5][MC1.7.10].jar)
UCHIJAA ChickenChunks{1.3.4.19} [ChickenChunks] (ChickenChunks-1.7.10-1.3.4.19-universal.jar)
UCHIJAA CoFHCore{1.7.10R3.0.3} [CoFH Core] (CoFHCore-[1.7.10]3.0.3-303.jar)
UCHIJAA CustomSpawner{3.3.0} [DrZhark's CustomSpawner] (CustomMobSpawner 3.3.0.zip)
UCHIJAA MoCreatures{6.3.1} [DrZhark's Mo'Creatures Mod] (DrZharks MoCreatures Mod v6.3.1.zip)
UCHIJAA endercore{1.7.10-0.0.1.13_alpha} [EnderCore] (EnderCore-1.7.10-0.0.1.13_alpha.jar)
UCHIJAA ForgeMultipart{1.2.0.345} [Forge Multipart] (ForgeMultipart-1.7.10-1.2.0.345-universal.jar)
UCHIJAA Mekanism{8.1.5} [Mekanism] (Mekanism-1.7.10-8.1.5.246.jar)
UCHIJAA EnderIO{1.7.10-2.2.8.381} [Ender IO] (EnderIO-1.7.10-2.2.8.381.jar)
UCHIJAA EnderStorage{1.4.7.33} [EnderStorage] (EnderStorage-1.7.10-1.4.7.33-universal.jar)
UCHIJAA Baubles{1.0.1.10} [Baubles] (Baubles-1.7.10-1.0.1.10.jar)
UCHIJAA ThermalFoundation{1.7.10R1.2.0} [Thermal Foundation] (ThermalFoundation-[1.7.10]1.2.0-102.jar)
UCHIJAA ThermalExpansion{1.7.10R4.0.3B1} [Thermal Expansion] (ThermalExpansion-[1.7.10]4.0.3B1-218.jar)
UCHIJAA EnderTech{1.7.10-0.3.2.388} [EnderTech] (EnderTech-1.7.10-0.3.2.388.jar)
UCHIJAA Mantle{1.7.10-0.3.2.jenkins184} [Mantle] (Mantle-1.7.10-0.3.2.jar)
UCHIJAA Waila{1.5.10} [Waila] (Waila-1.5.10_1.7.10.jar)
UCHIJAA TConstruct{1.7.10-1.8.5.build957} [Tinkers' Construct] (TConstruct-1.7.10-1.8.5.jar)
UCHIJAA ExtraUtilities{1.2.9} [Extra Utilities] (extrautilities-1.2.9.jar)
UCHIJAA guideapi{1.7.10-1.0.1-20} [Guide-API] (Guide-API-1.7.10-1.0.1-20.jar)
UCHIJAA iChunUtil{4.2.2} [iChunUtil] (iChunUtil-4.2.2.jar)
UCHIJAA inventorytweaks{1.59-dev-152-cf6e263} [Inventory Tweaks] (InventoryTweaks-1.59-dev-152.jar)
UCHIJAA IronChest{6.0.60.741} [Iron Chest] (ironchest-1.7.10-6.0.60.741-universal.jar)
UCHIJAA JABBA{1.2.1} [JABBA] (Jabba-1.2.1a_1.7.10.jar)
UCHIJAA journeymap{@[email protected]} [JourneyMap] (journeymap-1.7.10-5.1.0-unlimited.jar)
UCHIJAA MekanismGenerators{8.1.5} [MekanismGenerators] (MekanismGenerators-1.7.10-8.1.5.246.jar)
UCHIJAA MekanismTools{8.1.5} [MekanismTools] (MekanismTools-1.7.10-8.1.5.246.jar)
UCHIJAA Morph{0.9.1} [Morph] (Morph-Beta-0.9.1.jar)
UCHIJAA NEIAddons{1.12.11.36} [NEI Addons] (neiaddons-1.12.11.36-mc1.7.10.jar)
UCHIJAA NEIAddons|Developer{1.12.11.36} [NEI Addons: Developer Tools] (neiaddons-1.12.11.36-mc1.7.10.jar)
UCHIJAA NEIAddons|AppEng{1.12.11.36} [NEI Addons: Applied Energistics 2] (neiaddons-1.12.11.36-mc1.7.10.jar)
UCHIJAA NEIAddons|Botany{1.12.11.36} [NEI Addons: Botany] (neiaddons-1.12.11.36-mc1.7.10.jar)
UCHIJAA NEIAddons|Forestry{1.12.11.36} [NEI Addons: Forestry] (neiaddons-1.12.11.36-mc1.7.10.jar)
UCHIJAA NEIAddons|CraftingTables{1.12.11.36} [NEI Addons: Crafting Tables] (neiaddons-1.12.11.36-mc1.7.10.jar)
UCHIJAA NEIAddons|ExNihilo{1.12.11.36} [NEI Addons: Ex Nihilo] (neiaddons-1.12.11.36-mc1.7.10.jar)
UCHIJAA neiintegration{1.0.11} [NEI Integration] (NEIIntegration-MC1.7.10-1.0.11.jar)
UCHIJAA NetherOres{1.7.10R2.3.0} [Nether Ores] (NetherOres-[1.7.10]2.3.0-12.jar)
UCHIJAA OpenMods{0.7.3} [OpenMods] (OpenModsLib-1.7.10-0.7.3.jar)
UCHIJAA OpenBlocks{1.4.3} [OpenBlocks] (OpenBlocks-1.7.10-1.4.3.jar)
UCHIJAA Thaumcraft{4.2.3.5} [Thaumcraft] (Thaumcraft-1.7.10-4.2.3.5.jar)
UCHIJAA harvestcraft{1.7.10j} [Pam's HarvestCraft] (Pam's HarvestCraft 1.7.10j.jar)
UCHIJAA Roguelike{1.3.6.3} [Roguelike Dungeons] (roguelike-1.7.10-1.3.6.3.jar)
UCHIJAA SolarFlux{1.7.10-0.8a} [Solar Flux] (SolarFlux-1.7.10-0.8a.jar)
UCHIJAA tcnodetracker{1.1.2} [TC Node Tracker] (tcnodetracker-1.7.10-1.1.2.jar)
UCHIJAA thaumcraftneiplugin{@[email protected]} [Thaumcraft NEI Plugin] (thaumcraftneiplugin-1.7.10-1.7a.jar)
UCHIJAA ThaumicHorizons{1.1.5} [Thaumic Horizons] (thaumichorizons-1.7.10-1.1.6.jar)
UCHIJAA ThermalDynamics{1.7.10R1.1.0} [Thermal Dynamics] (ThermalDynamics-[1.7.10]1.1.0-161.jar)
UCHIJAA TiCTooltips{1.2.5} [TiC Tooltips] (TiCTooltips-mc1.7.10-1.2.5.jar)
UCHIJAA WailaHarvestability{1.1.2} [Waila Harvestability] (WailaHarvestability-mc1.7.x-1.1.2.jar)
UCHIJAA wailaplugins{MC1.7.10-0.1.0-16} [WAILA Plugins] (WAILAPlugins-MC1.7.10-0.1.0-16.jar)
UCHIJAA McMultipart{1.2.0.345} [Minecraft Multipart Plugin] (ForgeMultipart-1.7.10-1.2.0.345-universal.jar)
UCHIJAA IguanaTweaksTConstruct{1.7.10-2.1.5.140} [Iguana Tinker Tweaks] (IguanaTinkerTweaks-1.7.10-2.1.5.jar)
UCHIJAA ForgeMicroblock{1.2.0.345} [Forge Microblocks] (ForgeMultipart-1.7.10-1.2.0.345-universal.jar)
GL info: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
OpenModsLib class transformers: [stencil_patches:FINISHED],[movement_callback:FINISHED],[map_gen_fix:FINISHED],[gl_capabilities_hook:FINISHED],[player_render_hook:FINISHED]
Class transformer null safety: all safe
AE2 Version: stable rv2-stable-10 for Forge 10.13.2.1291
CoFHCore: -[1.7.10]3.0.3-303
ThermalFoundation: -[1.7.10]1.2.0-102
ThermalExpansion: -[1.7.10]4.0.3B1-218
Mantle Environment: Environment healthy.
TConstruct Environment: Environment healthy.
NetherOres: -[1.7.10]2.3.0-12
ThermalDynamics: -[1.7.10]1.1.0-161
Stencil buffer state: Function set: GL30, pool: forge, bits: 8
AE2 Integration: IC2:OFF, RotaryCraft:OFF, RC:OFF, BC:OFF, RF:ON, RFItem:ON, MFR:OFF, DSU:ON, FZ:OFF, FMP:ON, RB:OFF, CLApi:OFF, Waila:ON, InvTweaks:ON, NEI:ON, CraftGuide:OFF, Mekanism:ON, ImmibisMicroblocks:OFF, BetterStorage:OFF
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Player Count: 0 / 8; []
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'

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