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I installed forge and when i load up minecraft, i can go on a singleplayer world with nothing wrong, no crashes or anything. But when i go on a multiplayer world, it logs in, then it crashes.

Here is the crash report:

---- Minecraft Crash Report ----
// Don't be sad. I'll do better next time, I promise!

Time: 18/09/13 7:30 AM
Description: Ticking screen

java.lang.NullPointerException
at java.net.URLEncoder.encode(Unknown Source)
at net.minecraft.client.multiplayer.NetClientHandler.func_72549_a(NetClientHandler.java:336)
at net.minecraft.client.multiplayer.NetClientHandler.func_72550_a(NetClientHandler.java:318)
at net.minecraft.client.multiplayer.NetClientHandler.func_72470_a(NetClientHandler.java:299)
at net.minecraft.network.packet.Packet253ServerAuthData.func_73279_a(SourceFile:41)
at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:458)
at net.minecraft.client.multiplayer.NetClientHandler.func_72551_d(NetClientHandler.java:281)
at net.minecraft.client.multiplayer.GuiConnecting.func_73876_c(GuiConnecting.java:51)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1568)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:898)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:826)
at net.minecraft.client.main.Main.main(SourceFile:101)
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:57)
at net.minecraft.launchwrapper.Launch.main(Launch.java:18)


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

-- Head --
Stacktrace:
at java.net.URLEncoder.encode(Unknown Source)
at net.minecraft.client.multiplayer.NetClientHandler.func_72549_a(NetClientHandler.java:336)
at net.minecraft.client.multiplayer.NetClientHandler.func_72550_a(NetClientHandler.java:318)
at net.minecraft.client.multiplayer.NetClientHandler.func_72470_a(NetClientHandler.java:299)
at net.minecraft.network.packet.Packet253ServerAuthData.func_73279_a(SourceFile:41)
at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:458)
at net.minecraft.client.multiplayer.NetClientHandler.func_72551_d(NetClientHandler.java:281)
at net.minecraft.client.multiplayer.GuiConnecting.func_73876_c(GuiConnecting.java:51)

-- Affected screen --
Details:
Screen name: net.minecraft.client.multiplayer.GuiConnecting
Stacktrace:
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1568)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:898)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:826)
at net.minecraft.client.main.Main.main(SourceFile:101)
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:57)
at net.minecraft.launchwrapper.Launch.main(Launch.java:18)

-- System Details --
Details:
Minecraft Version: 1.6.2
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0, Oracle Corporation
Java VM Version: Java HotSpot™ 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 324806720 bytes (309 MB) / 407896064 bytes (389 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v8.04 FML v6.2.35.804 Minecraft Forge 9.10.0.804 5 mods loaded, 5 mods active
mcp{8.04} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
FML{6.2.35.804} [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Forge{9.10.0.804} [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
DamageIndicatorsMod{2.9.0.1} [Damage Indicators] (1.6.2 DamageIndicators v2.9.0.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
mod_Xray{MX for 1.6.2} [mod_Xray] (mod_XrayV1.11 (1).zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Launched Version: UnknownFMLProfile
LWJGL: 2.9.0
OpenGL: Intel® HD Graphics 3000 GL version 3.1.0 - Build 9.17.10.3223, Intel
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Pack: Default
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null


Any help?

Can anyone help?