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When I start up Minecraft 1.5.1 for the Aether ll mod it crashes. I have Forge, Player API, Render Player API, Rei Minimap mod, the backpack mod and the Aether ll mod all for 1.5.1.

This is the crash report:
Minecraft has crashed!
----------------------

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

A full error report has been saved to C:\Users\Tristen\AppData\Roaming\.minecraft\crash-reports\crash-2013-08-18_16.53.27-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 d4daa213 --------
Full report at:
C:\Users\Tristen\AppData\Roaming\.minecraft\crash-reports\crash-2013-08-18_16.53.27-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 8/18/13 4:53 PM

-- System Details --
Details:
Minecraft Version: 1.5.1
Operating System: Windows Vista (x86) version 6.0
Java Version: 1.7.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
Memory: 365843560 bytes (348 MB) / 518979584 bytes (494 MB) up to 518979584 bytes (494 MB)
JVM Flags: 2 total; -Xms512m -Xmx512m
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 v5.1.43.675 Minecraft Forge 7.7.1.675 7 mods loaded, 7 mods active
mcp{7.44} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
FML{5.1.43.675} [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Forge{7.7.1.675} [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Backpack{1.7.8} [Backpack] (backpack-1.7.8-1.5.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
mod_ReiMinimap{v3.3_04 [1.5.1]} [mod_ReiMinimap] ([1.5.1]ReiMinimap_v3.3_04.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
Aether II{Alpha v1.0.1} [Aether II] (AetherII_Alpha_v1.0.2_MC1.5.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
MainMenuAPI{1.0.0} [Main Menu API] (AetherII_Alpha_v1.0.2_MC1.5.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available
LWJGL: 2.9.0
OpenGL: AMD Radeon HD 6300 series Graphics GL version 4.1.10750 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: ~~ERROR~~ NullPointerException: null

java.lang.NumberFormatException: null
at java.lang.Integer.parseInt(Unknown Source)
at java.lang.Integer.valueOf(Unknown Source)
at net.aetherteam.mainmenu_api.MenuBaseConfig.loadConfig(MenuBaseConfig.java:59)
at net.aetherteam.mainmenu_api.MenuBaseLoaderWithSlider.func_73866_w_(MenuBaseLoaderWithSlider.java:94)
at net.minecraft.client.gui.GuiScreen.func_73872_a(SourceFile:98)
at net.minecraft.client.Minecraft.func_71373_a(Minecraft.java:642)
at net.aetherteam.mainmenu_api.client.MenuClientTickHandler.tickEnd(MenuClientTickHandler.java:37)
at cpw.mods.fml.common.SingleIntervalHandler.tickEnd(SingleIntervalHandler.java:34)
at cpw.mods.fml.common.FMLCommonHandler.tickEnd(FMLCommonHandler.java:141)
at cpw.mods.fml.common.FMLCommonHandler.onPostClientTick(FMLCommonHandler.java:367)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1901)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:834)
at net.minecraft.client.Minecraft.run(Minecraft.java:759)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT d00eff1f ----------

Maybe the mods are conflicting with each other?

The thing is, it worked before and all of a sudden it just crashed out of nowhere,

Quote from MuzikKillz

The thing is, it worked before and all of a sudden it just crashed out of nowhere,

You could ask the creator of forge and he might be able to help you.