I can't open minecraft because a fatal error

I can not solve this

java.lang.NullPointerException at net.minecraft.launcher.GameLauncher.getMinecraftArguments(GameLauncher.java:479) at net.minecraft.launcher.GameLauncher.launchGame(GameLauncher.java:422) at net.minecraft.launcher.GameLauncher.onDownloadJobFinished(GameLauncher.java:690) at net.minecraft.launcher.updater.download.DownloadJob.popAndDownload(DownloadJob.java:124) at net.minecraft.launcher.updater.download.DownloadJob.access$000(DownloadJob.java:15) at net.minecraft.launcher.updater.download.DownloadJob$1.run(DownloadJob.java:94) at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source) at java.util.concurrent.FutureTask.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source)