Put the summary of the bug you're having here

What I expected to happen was...:
start up minecraft

What actually happened was...:
minecraft wont let me click on the play button

Steps to Reproduce::16:27 INFO]: Job 'Version & Libraries' finished successfully (took 0:00:02.493)
[22:16:37 INFO]: Download job 'Resources' skipped as there are no files to download
[22:16:37 INFO]: Job 'Resources' finished successfully (took 0:00:00.000)
[22:16:37 INFO]: Launching game
[22:16:37 INFO]: Looking for old natives to clean up...
[22:16:38 INFO]: Unpacking natives to C:\Users\maik\AppData\Roaming\.minecraft\versions\1.6.4\1.6.4-natives-493021354334
[22:16:38 INFO]: Launching in C:\Users\maik\AppData\Roaming\.minecraft
[22:16:38 FATAL]: Fatal error launching game. Report this to http://mojang.atlassian.net please!
java.lang.NullPointerException
at net.minecraft.launcher.GameLauncher.getMinecraftArguments(GameLauncher.java:316) ~[launcher.jar:?]
at net.minecraft.launcher.GameLauncher.launchGame(GameLauncher.java:251) ~[launcher.jar:?]
at net.minecraft.launcher.GameLauncher.onDownloadJobFinished(GameLauncher.java:524) [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_21]
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source) [?:1.7.0_21]
at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.7.0_21]
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.7.0_21]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.7.0_21]
at java.lang.Thread.run(Unknown Source) [?:1.7.0_21]
[22:16:58 INFO]: Logging in with username & password
[22:24:41 INFO]: Logging in with username & password