Fatal Error in launcher.

Fatal Error when launching game.

What I expected to happen was...:
Minecraft 1.7.2 will launch.

What actually happened was...:
There cames Fatal Error when game, was loading.

Steps to Reproduce:
1.I logged out my brothers account.
2.I logged in with my account.
3.I press play button and game starts loading.
4.In Development Console reads: [14:47:10 FATAL]: Fatal error launching game. Report this to http://mojang.atlassian.net please!

java.lang.NullPointerException
	at net.minecraft.launcher.GameLauncher.getMinecraftArguments(GameLauncher.java:309) ~[launcher.jar:?]
	at net.minecraft.launcher.GameLauncher.launchGame(GameLauncher.java:254) ~[launcher.jar:?]
	at net.minecraft.launcher.GameLauncher.onDownloadJobFinished(GameLauncher.java:517) [launcher.jar:?]
	at net.minecraft.launcher.updater.download.DownloadJob.startDownloading(DownloadJob.java:80) [launcher.jar:?]
	at net.minecraft.launcher.Launcher$1.run(Launcher.java:168) [launcher.jar:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.7.0_45]

I linked console file.