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Alright, I already have forge installed for 1.8 and both Advanced Capes Jar and Optfine in the mods folder. Both of which work fine in singleplayer, but whenever I try to join a multiplayer server it gives me this error. Also, I have faithful x32 as a texture pack.

---- Minecraft Crash Report ----
// I let you down. Sorry

Time: 8/13/15 8:47 PM
Description: Rendering item

java.lang.NoClassDefFoundError: net/minecraftforge/client/model/ISmartItemModel
at net.minecraft.client.renderer.ItemModelMesher.func_178089_a(ItemModelMesher.java:55)
at net.minecraft.client.renderer.entity.RenderItem.func_175042_a(RenderItem.java:370)
at net.minecraft.client.renderer.entity.RenderItem.func_180450_b(RenderItem.java:421)
at net.minecraft.client.gui.GuiIngame.func_175184_a(GuiIngame.java:1059)
at net.minecraft.client.gui.GuiIngame.func_180479_a(GuiIngame.java:378)
at net.minecraftforge.client.GuiIngameForge.func_180479_a(GuiIngameForge.java:306)
at net.minecraftforge.client.GuiIngameForge.func_175180_a(GuiIngameForge.java:130)
at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1266)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1048)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:345)
at net.minecraft.client.main.Main.main(SourceFile:120)
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 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 net.minecraft.client.renderer.ItemModelMesher.func_178089_a(ItemModelMesher.java:55)
at net.minecraft.client.renderer.entity.RenderItem.func_175042_a(RenderItem.java:370)

-- Item being rendered --
Details:
Item Type: [email protected]
Item Aux: 81
Item NBT: {ench:[0:{lvl:5s,id:16s,},1:{lvl:3s,id:34s,},2:{lvl:2s,id:20s,},3:{lvl:3s,id:21s,},],RepairCost:15,display:{Name:"The Ghost Buster????",},}
Item Foil: true
Stacktrace:
at net.minecraft.client.renderer.entity.RenderItem.func_180450_b(RenderItem.java:421)
at net.minecraft.client.gui.GuiIngame.func_175184_a(GuiIngame.java:1059)
at net.minecraft.client.gui.GuiIngame.func_180479_a(GuiIngame.java:378)
at net.minecraftforge.client.GuiIngameForge.func_180479_a(GuiIngameForge.java:306)
at net.minecraftforge.client.GuiIngameForge.func_175180_a(GuiIngameForge.java:130)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityPlayerSP['Hubbledub'/2048831, l='MpServer', x=225.16, y=93.22, z=166.62]]
Chunk stats: MultiplayerChunkCache: 0, 0
Level seed: 0
Level generator: ID 03 - amplified, ver 0. Features enabled: false
Level generator options:
Level spawn location: 231.00,83.00,175.00 - World: (231,83,175), Chunk: (at 7,5,15 in 14,10; contains blocks 224,0,160 to 239,255,175), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 65018400 game time, 65825544 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: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 1 total; [EntityPlayerSP['Hubbledub'/2048831, l='MpServer', x=225.16, y=93.22, z=166.62]]
Retry entities: 0 total; []
Server brand: Spigot
Server type: Non-integrated multiplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:407)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2488)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:367)
at net.minecraft.client.main.Main.main(SourceFile:120)
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 net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
Minecraft Version: 1.8
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.8.0_31, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 315882552 bytes (301 MB) / 622972928 bytes (594 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
FML: MCP v9.10 FML v8.0.14.1281 Minecraft Forge 11.14.0.1281 Optifine OptiFine_1.8_HD_U_D5 4 mods loaded, 4 mods active
mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available
FML{8.0.14.1281} [Forge Mod Loader] (forge-1.8-11.14.0.1281-1.8.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available
Forge{11.14.0.1281} [Minecraft Forge] (forge-1.8-11.14.0.1281-1.8.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available
advcapes{2.4} [Advanced Capes] (advancedcapes-2.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available
Launched Version: 1.8-Forge11.14.0.1281-1.8
LWJGL: 2.9.1
OpenGL: GeForce GTX 750 Ti/PCIe/SSE2 GL version 4.5.0 NVIDIA 353.62, NVIDIA Corporation
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: No
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Packs: [faithful32pack.zip]
Current Language: English (US)
Profiler Position: N/A (disabled)