My minecraft keeps crashing ever since I tried to install mods. What should I do?

Crash report:
---- Minecraft Crash Report ----
// This doesn't make any sense!

Time: 6/24/14 12:15 PM
Description: Initializing game

java.lang.NullPointerException: Initializing game
at cpw.mods.fml.common.Loader.preinitializeMods(Loader.java:506)
at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:239)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:467)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:815)
at net.minecraft.client.main.Main.main(SourceFile:103)
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:134)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

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

-- Head --
Stacktrace:
at cpw.mods.fml.common.Loader.preinitializeMods(Loader.java:506)
at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:239)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:467)

-- Initialization --
Details:
Stacktrace:
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:815)
at net.minecraft.client.main.Main.main(SourceFile:103)
a

Guest

Your gonna have to unindtall mine craft or crest a new profile with no mods but if you uninstall remember to back up your saved worlds

Mason

If you have already downloaded the mod you want to play then back up the files of saved worlds so you won't lose them. After that delete minecraft and reinstall it. Then you create a new profile just for that mod and make it to whatever version that is required to play that mod. Now it shouldn't be crashing, but if it does then search up some tips to fix it. If you didn't download the mod yet then just go on youtube or search up how to download a mod.

Ninja