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Lately minecraft has been crashing a lot. When I start minecraft it's fine but when i try to join a server it crashes. Full report here:

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

Time: 4/22/13 4:31 PM
Description: Ticking screen

java.lang.NoClassDefFoundError: com/sijobe/spc/core/HookManager
at net.minecraft.client.entity.EntityClientPlayerMP.<clinit>(EntityClientPlayerMP.java:36)
at net.minecraft.client.multiplayer.PlayerControllerMP.func_78754_a(PlayerControllerMP.java:445)
at net.minecraft.client.Minecraft.func_71353_a(Minecraft.java:2091)
at net.minecraft.client.Minecraft.func_71403_a(Minecraft.java:2009)
at net.minecraft.client.multiplayer.NetClientHandler.func_72455_a(NetClientHandler.java:335)
at net.minecraft.network.packet.Packet1Login.func_73279_a(Packet1Login.java:119)
at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:461)
at net.minecraft.client.multiplayer.NetClientHandler.func_72551_d(NetClientHandler.java:266)
at net.minecraft.client.multiplayer.GuiConnecting.func_73876_c(GuiConnecting.java:51)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1522)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:831)
at net.minecraft.client.Minecraft.run(Minecraft.java:756)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: com.sijobe.spc.core.HookManager
at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:211)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
... 13 more
Caused by: java.lang.NullPointerException
at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:200)
... 16 more


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

-- Head --
Stacktrace:
at net.minecraft.client.entity.EntityClientPlayerMP.<clinit>(EntityClientPlayerMP.java:36)
at net.minecraft.client.multiplayer.PlayerControllerMP.func_78754_a(PlayerControllerMP.java:445)
at net.minecraft.client.Minecraft.func_71353_a(Minecraft.java:2091)
at net.minecraft.client.Minecraft.func_71403_a(Minecraft.java:2009)
at net.minecraft.client.multiplayer.NetClientHandler.func_72455_a(NetClientHandler.java:335)
at net.minecraft.network.packet.Packet1Login.func_73279_a(Packet1Login.java:119)
at net.minecraft.network.TcpConnection.func_74428_b(TcpConnection.java:461)
at net.minecraft.client.multiplayer.NetClientHandler.func_72551_d(NetClientHandler.java:266)
at net.minecraft.client.multiplayer.GuiConnecting.func_73876_c(GuiConnecting.java:51)

-- Affected screen --
Details:
Screen name: net.minecraft.client.multiplayer.GuiConnecting

-- Affected level --
Details:
Level name: MpServer
All players: 0 total; []
Chunk stats: MultiplayerChunkCache: 0
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (8,64,8), Chunk: (at 8,4,8 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 0 game time, 0 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: 0 total; []
Retry entities: 0 total; []
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:441)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2405)
at net.minecraft.client.Minecraft.run(Minecraft.java:772)
at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
Minecraft Version: 1.5.1
Operating System: Windows Vista (x86) version 6.0
Java Version: 1.6.0_06, Sun Microsystems Inc.
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Sun Microsystems Inc.
Memory: 456174520 bytes (435 MB) / 532807680 bytes (508 MB) up to 1065484288 bytes (1016 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
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 v7.44 FML v5.1.3.605 Minecraft Forge 7.7.0.605 Optifine OptiFine_1.5.1_HD_B1 5 mods loaded, 5 mods active
mcp [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
FML [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Forge [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
FlansMod [Flan's Mod] (Flans-Mod-1.5.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MCCapesForge [MCCapes] (mccapes-0.0.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
LWJGL: 2.4.2
OpenGL: Intel Cantiga GL version 1.5.0 - Build 7.15.10.1502, Intel
Is Modded: Definitely; Client brand changed to 'forge,fml'
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used