Put the summary of the bug you're having here

What I expected to happen was...:
The game would start up

It fell over with a Java exception

Steps to Reproduce:
1. Input Username and password, Clicked play, got the following error.

Client> 2013-07-28 15:56:02 [CLIENT] [INFO] Setting user: RapSteve
Client> 2013-07-28 15:56:02 [CLIENT] [INFO] (Session ID is token:8148e2c8b53a49128b3bec8d203863ee:4ad70001b0c4462a98d64d03a0c4850e)
Client> java.lang.NullPointerException
Client> at java.io.Reader.<init>(Unknown Source)
Client> at java.io.InputStreamReader.<init>(Unknown Source)
Client> at la.<init>(SourceFile:15)
Client> at la.<clinit>(SourceFile:9)
Client> at kt.g(SourceFile:37)
Client> at kq.g(SourceFile:15)
Client> at kz.<clinit>(SourceFile:27)
Client> at ats.<init>(SourceFile:201)
Client> at net.minecraft.client.main.Main.main(SourceFile:83)
Client> Exception in thread "main" java.lang.ExceptionInInitializerError
Client> at bt.<clinit>(SourceFile:7)
Client> at yb.v(SourceFile:495)
Client> at kz.a(SourceFile:139)
Client> at kz.c(SourceFile:85)
Client> at yb.<clinit>(SourceFile:310)
Client> at aqw.<clinit>(SourceFile:362)
Client> at kz.a(SourceFile:122)
Client> at kz.<clinit>(SourceFile:55)
Client> at ats.<init>(SourceFile:201)
Client> at net.minecraft.client.main.Main.main(SourceFile:83)
Client> Caused by: java.lang.NullPointerException
Client> at java.io.Reader.<init>(Unknown Source)
Client> at java.io.InputStreamReader.<init>(Unknown Source)
Client> at org.apache.commons.io.IOUtils.readLines(IOUtils.java:986)
Client> at bu.<init>(SourceFile:26)
Client> at bu.<clinit>(SourceFile:19)
Client> ... 10 more
Game ended with bad state (exit code 1)
Ignoring visibility rule and showing launcher due to a game crash
Deleting C:\Users\The RED BARON!!!\AppData\Roaming\.minecraft\versions\1.6.2\1.6.2-natives-964504391484
Couldn't delete C:\Users\The RED BARON!!!\AppData\Roaming\.minecraft\versions\1.6.2\1.6.2-natives-964504391484 - scheduling for deletion upon exit