lancher wont start minecraft

Here Is The Crash Report:

---- Minecraft Crash Report ----
// There are four lights!

Time: 6/19/15 8:13 AM
Description: Unexpected error

java.lang.NullPointerException: Unexpected error
at bac.k(SourceFile:129)
at bjb.a(SourceFile:1109)
at ic.a(SourceFile:43)
at ic.a(SourceFile:9)
at ej.a(SourceFile:174)
at bje.e(SourceFile:212)
at bao.p(SourceFile:1306)
at bao.ak(SourceFile:774)
at bao.f(SourceFile:728)
at net.minecraft.client.main.Main.main(SourceFile:148)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)