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So I installed forge but I have NO MODS. I took all the mods out of my mods folder reinstalled forge and it still crashes.

Single Player works but when I join a server for example mineplex or hypixel it goes as far as downloading terrain and just crashes...

---- Minecraft Crash Report ----
// But it works on my machine.

Time: 4/23/16 1:13 PM
Description: Unexpected error

java.util.UnknownFormatConversionException: Conversion = 'O'
at java.util.Formatter$FormatSpecifier.conversion(Unknown Source)
at java.util.Formatter$FormatSpecifier.<init>(Unknown Source)
at java.util.Formatter.parse(Unknown Source)
at java.util.Formatter.format(Unknown Source)
at java.util.Formatter.format(Unknown Source)
at java.lang.String.format(Unknown Source)
at net.minecraftforge.fml.relauncher.FMLRelaunchLog.log(FMLRelaunchLog.java:83)
at net.minecraftforge.fml.common.FMLLog.log(FMLLog.java:40)
at net.minecraftforge.fml.common.FMLCommonHandler.callFuture(FMLCommonHandler.java:718)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1011)
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 java.util.Formatter$FormatSpecifier.conversion(Unknown Source)
at java.util.Formatter$FormatSpecifier.<init>(Unknown Source)
at java.util.Formatter.parse(Unknown Source)
at java.util.Formatter.format(Unknown Source)
at java.util.Formatter.format(Unknown Source)
at java.lang.String.format(Unknown Source)
at net.minecraftforge.fml.relauncher.FMLRelaunchLog.log(FMLRelaunchLog.java:83)
at net.minecraftforge.fml.common.FMLLog.log(FMLLog.java:40)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityPlayerSP['JeyKore'/8020458, l='MpServer', x=0.50, y=84.00, z=0.50]]
Chunk stats: MultiplayerChunkCache: 0, 0
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: -447.00,4.00,2352.00 - World: (-447,4,2352), Chunk: (at 1,0,0 in -28,147; contains blocks -448,0,2352 to -433,255,2367), Region: (-1,4; contains chunks -32,128 to -1,159, blocks -512,0,2048 to -1,255,2559)
Level time: 12990983 game time, 106836654000 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['JeyKore'/8020458, l='MpServer', x=0.50, y=84.00, z=0.50]]
Retry entities: 0 total; []
Server brand: BungeeCord (git:BungeeCord-Bootstrap:1.9-SNAPSHOT:d1a1e87:1140) <- Mineplex Spigot
Server type: Non-integrated multiplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:351)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2488)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:374)
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 10 (amd64) version 10.0
Java Version: 1.8.0_77, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 166825840 bytes (159 MB) / 338939904 bytes (323 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: 0, tallocated: 0
FML: MCP v9.10 FML v8.0.37.1334 Minecraft Forge 11.14.1.1334 3 mods loaded, 3 mods active
mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
FML{8.0.37.1334} [Forge Mod Loader] (forge-1.8-11.14.1.1334.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Forge{11.14.1.1334} [Minecraft Forge] (forge-1.8-11.14.1.1334.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Loaded coremods (and transformers):
Launched Version: 1.8-Forge11.14.1.1334
LWJGL: 2.9.1
OpenGL: GeForce GTX 950/PCIe/SSE2 GL version 4.5.0 NVIDIA 358.91, 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: [§f§l32x InFinite]
Current Language: English (US)
Profiler Position: N/A (disabled)