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So I've been playing with custom mods, and I decided to get rid of one of them. It started crashing, so I took out some client mod and got this.

---- Minecraft Crash Report ----
// I just don't know what went wrong

Time: 2/21/16 9:53 PM
Description: Exception in server tick loop

java.lang.NoClassDefFoundError: net/minecraft/client/gui/GuiScreen
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Unknown Source)
at java.lang.Class.getConstructor0(Unknown Source)
at java.lang.Class.getConstructor(Unknown Source)
at net.minecraft.world.SpawnerAnimals.func_77191_a(SpawnerAnimals.java:260)
at net.minecraft.world.gen.ChunkProviderGenerate.func_73153_a(ChunkProviderGenerate.java:424)
at net.minecraft.world.gen.ChunkProviderServer.func_73153_a(ChunkProviderServer.java:279)
at net.minecraft.world.chunk.Chunk.func_76624_a(Chunk.java:1055)
at net.minecraft.world.gen.ChunkProviderServer.originalLoadChunk(ChunkProviderServer.java:190)
at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:131)
at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:101)
at net.minecraft.server.MinecraftServer.func_71222_d(MinecraftServer.java:265)
at net.minecraft.server.MinecraftServer.func_71247_a(MinecraftServer.java:235)
at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:258)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:387)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.gui.GuiScreen
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:191)
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 bdw for invalid side SERVER
at cpw.mods.fml.common.asm.transformers.SideTransformer.transform(SideTransformer.java:50)
at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:279)
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:176)
... 18 more

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: Linux (amd64) version 2.6.32-504.16.2.el6.x86_64
Java Version: 1.7.0_80, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 120620720 bytes (115 MB) / 518979584 bytes (494 MB) up to 518979584 bytes (494 MB)
JVM Flags: 5 total; -Xmx512M -Xms512M -XX:+UseConcMarkSweepGC -XX:+CMSClassUnloadingEnabled -XX:MaxPermSize=256M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1448 35 mods loaded, 35 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-1.7.10-10.13.4.1448-1.7.10-universal.jar)
UCHIJAA Forge{10.13.4.1448} [Minecraft Forge] (forge-1.7.10-10.13.4.1448-1.7.10-universal.jar)
UCHIJAA AM2-Preloader{0.0.3} [AMCore] (minecraft.jar)
UCHIJAA appliedenergistics2-core{rv2-stable-10} [AppliedEnergistics2 Core] (minecraft.jar)
UCHIJAA CodeChickenCore{1.0.6.44} [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{0.9} [OpenModsCore] (minecraft.jar)
UCHIJAA AnimationAPI{1.2.4} [AnimationAPI] (AnimationAPI-1.7.10-1.2.4.jar)
UCHIJAA arsmagica2{1.4.0.009} [Ars Magica 2] (1.7.10_AM2-1.4.0.009.jar)
UCHIJAA IC2{2.2.814-experimental} [IndustrialCraft 2] (industrialcraft-2-2.2.814-experimental.jar)
UCHIJAA advancedgenetics{1.5.9} [Advanced Genetics] (advancedgenetics-1.7.10-1.5.9.jar)
UCHIJAA Baubles{1.0.1.10} [Baubles] (Baubles-1.7.10-1.0.1.10.jar)
UCHIJAA adventurebackpack{1.7.10-0.8b} [Adventure Backpack] (adventurebackpack-1.7.10-0.8c.jar)
UCHIJAA appliedenergistics2{rv2-stable-10} [Applied Energistics 2] (appliedenergistics2-rv2-stable-10.jar)
UCHIJAA BiblioCraft{1.11.4} [BiblioCraft] (BiblioCraft[v1.11.4][MC1.7.10].jar)
UCHIJAA AWWayofTime{v1.3.3} [Blood Magic: Alchemical Wizardry] (BloodMagic-1.7.10-1.3.3-17.jar)
UCHIJAA Thaumcraft{4.2.3.5} [Thaumcraft] (Thaumcraft-1.7.10-4.2.3.5.jar)
UCHIJAA Botania{r1.8-248} [Botania] (Botania r1.8-248.jar)
UCHIJAA CopiousDogs{${mcversion}-${version}} [Copious Dogs] (copious-dogs-1.7.10-1.1.2.jar)
UCHIJAA ExtraUtilities{1.2.12} [Extra Utilities] (extrautilities-1.2.12.jar)
UCHIJAA Forestry{3.1.0.3} [Forestry for Minecraft] (forestry_1.7.10-3.1.0.3.jar)
UCHIJAA iChunUtil{4.2.2} [iChunUtil] (iChunUtil-4.2.2.jar)
UCHIJAA Hats{4.0.1} [Hats] (Hats-4.0.1.jar)
UCHIJAA InventoryPets{1.3.91} [Inventory Pets] (inventorypets-1.7.10-1.3.91-universal.jar)
UCHIJAA inventorytweaks{1.59-dev-152-cf6e263} [Inventory Tweaks] (InventoryTweaks-1.59-dev-152.jar)
UCHIJAA JABBA{1.2.1} [JABBA] (Jabba-1.2.1a_1.7.10.jar)
UCHIJAA RadixCore{2.1.1} [RadixCore] (RadixCore-1.7.10-2.1.1-universal.jar)
UCHIJAA MCA{1.7.10-5.1.1.2} [Minecraft Comes Alive] (MCA-1.7.10-5.1.1.2-universal.jar)
UCHIJAA Morph{0.9.2} [Morph] (Morph-Beta-0.9.2.jar)
UCHIJAA cfm{3.4.7} [�9MrCrayfish's Furniture Mod] (MrCrayfishFurnitureModv3.4.7(1.7.10).jar)
UCHIJAA OpenMods{0.9} [OpenMods] (OpenModsLib-1.7.10-0.9-snapshot-435.jar)
UCHIJAA OpenBlocks{1.5} [OpenBlocks] (OpenBlocks-1.7.10-1.5-snapshot-706.jar)
UCHIJAA harvestcraft{1.7.10j} [Pam's HarvestCraft] (Pam's HarvestCraft 1.7.10j.jar)
UCHIJAA witchery{0.24.1} [Witchery] (witchery-1.7.10-0.24.1.jar)
OpenModsLib class transformers: [gl_capabilities_hook:ENABLED],[player_render_hook:ENABLED],[map_gen_fix:FINISHED],[movement_callback:ENABLED],[stencil_patches:ENABLED]
Class transformer null safety: all safe
AE2 Version: stable rv2-stable-10 for Forge 10.13.2.1291
AE2 Integration: IC2:ON, RotaryCraft:OFF, RC:OFF, BC:OFF, RF:ON, RFItem:ON, MFR:OFF, DSU:ON, FZ:OFF, FMP:OFF, RB:OFF, CLApi:OFF, Waila:OFF, Mekanism:OFF, 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 / 12; []
Is Modded: Definitely; Server brand changed to 'fml,forge'
Type: Dedicated Server (map_server.txt)

So what happened? Can anyone help me?