java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.mojang.util.UUIDTypeAdapter.fromUUID(UUIDTypeAdapter.java:22)
at net.minecraft.launcher.GameLauncher.getMinecraftArguments(GameLauncher.java:386)
at net.minecraft.launcher.GameLauncher.launchGame(GameLauncher.java:281)
at net.minecraft.launcher.GameLauncher.onDownloadJobFinished(GameLauncher.java:627)
at net.minecraft.launcher.updater.download.DownloadJob.popAndDownload(DownloadJob.java:120)
at net.minecraft.launcher.updater.download.DownloadJob.access$000(DownloadJob.java:12)
at net.minecraft.launcher.updater.download.DownloadJob$1.run(DownloadJob.java:89)
at java.util.concurrent.Executors$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)

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