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My minecraft keeps crashing while trying to make a new world with NO mods, here's the crash report

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Minecraft has crashed!
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Minecraft has stopped running because it encountered a problem; Unexpected error

A full error report has been saved to C:\Users\nancyr\AppData\Roaming\.minecraft\crash-reports\crash-2013-05-05_11.31.51-client.txt - Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash



--- BEGIN ERROR REPORT 5ca5ecf6 --------
Full report at:
C:\Users\nancyr\AppData\Roaming\.minecraft\crash-reports\crash-2013-05-05_11.31.51-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 5/5/13 11:31 AM

-- Head --
Stacktrace:
at net.minecraft.client.renderer.RenderBlocks.func_78612_b(RenderBlocks.java:471)
at net.minecraft.client.renderer.WorldRenderer.func_78907_a(WorldRenderer.java:226)
at net.minecraft.client.renderer.RenderGlobal.func_72716_a(RenderGlobal.java:1535)
at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1119)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['User_7187'/126, l='MpServer', x=-56.50, y=69.62, z=363.50]]
Chunk stats: MultiplayerChunkCache: 5
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-58,64,361), Chunk: (at 6,4,9 in -4,22; contains blocks -64,0,352 to -49,255,367), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 154 game time, 154 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; [EntityClientPlayerMP['User_7187'/126, l='MpServer', x=-56.50, y=69.62, z=363.50]]
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:779)
at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
Minecraft Version: 1.5.1
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_17, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 345095576 bytes (329 MB) / 503775232 bytes (480 MB) up to 503775232 bytes (480 MB)
JVM Flags: 2 total; -Xms512m -Xmx512m
AABB Pool Size: 9011 (504616 bytes; 0 MB) allocated, 40 (2240 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
FML: MCP v7.44 FML v5.1.14.630 Minecraft Forge 7.7.1.630 3 mods loaded, 3 mods active
mcp [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
LWJGL: 2.4.2
OpenGL: AMD Radeon HD 6320 Graphics GL version 4.1.10834 Compatibility Profile Context, ATI Technologies Inc.
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: 121 (6776 bytes; 0 MB) allocated, 75 (4200 bytes; 0 MB) used

java.lang.NoClassDefFoundError: cjb/rebirth/xray/client/XRayMod
at net.minecraft.client.renderer.RenderBlocks.func_78612_b(RenderBlocks.java:471)
at net.minecraft.client.renderer.WorldRenderer.func_78907_a(WorldRenderer.java:226)
at net.minecraft.client.renderer.RenderGlobal.func_72716_a(RenderGlobal.java:1535)
at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1119)
at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:987)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:867)
at net.minecraft.client.Minecraft.run(Minecraft.java:756)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: cjb.rebirth.xray.client.XRayMod
at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:238)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 8 more
Caused by: java.lang.NullPointerException
--- END ERROR REPORT 62ba2898 ----------




-- Head --
Stacktrace:
at net.minecraft.client.renderer.RenderBlocks.func_78612_b(RenderBlocks.java:471)
at net.minecraft.client.renderer.WorldRenderer.func_78907_a(WorldRenderer.java:226)
at net.minecraft.client.renderer.RenderGlobal.func_72716_a(RenderGlobal.java:1535)
at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1119)

What does that mean, and what can i do to fix it?!

I had forge running but what could that do?

NVM just fixed it, but WHY DO I NEED MODS TO GENERATE A WORLD?!