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Basically im trying to use this mod pack for the technic launcher but for some reason i cant use it so the owner made me a separate modpack without optifine since it was making my launcher crash and this is the crash report and i wondered if any one could help me and see if they can see whats going wrong please and thank you.

Minecraft Version: 1.5.1
Operating System: Mac OS X (x86_64) version 10.6.8
Java Version: 1.6.0_45, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 24558200 bytes (23 MB) / 116490240 bytes (111 MB) up to 1065025536 bytes (1015 MB)
JVM Flags: 2 total; -Xmx1024m -XX:MaxPermSize=128m
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:
LWJGL: 2.4.2
OpenGL: ATI Radeon HD 4670 OpenGL Engine GL version 2.1 ATI-1.6.36, 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: ~~ERROR~~ NullPointerException: null

org.lwjgl.opengl.OpenGLException: Invalid value (1281)
at org.lwjgl.opengl.Util.checkGLError(Util.java:56)
at org.lwjgl.opengl.Display.swapBuffers(Display.java:645)
at net.minecraft.client.Minecraft.func_71357_I(Minecraft.java:514)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:403)
at net.minecraft.client.MinecraftAppletImpl.func_71384_a(SourceFile:56)
at net.minecraft.client.Minecraft.run(Minecraft.java:729)
at java.lang.Thread.run(Thread.java:680)