I was trying to launch Minecraft 1.7.10 but it stopped.

I was trying to launch Minecraft 1.7.10 for the first time I think but the launcher stopped the launch. I found this in the log output:
[16:58:59 FATAL]: Fatal error launching game. Report this to http://bugs.mojang.com please!
java.lang.NullPointerException
at com.mojang.util.UUIDTypeAdapter.fromUUID(UUIDTypeAdapter.java:22) ~[launcher_mcpatched.jar:?]
at net.minecraft.launcher.game.MinecraftGameRunner.getMinecraftArguments(MinecraftGameRunner.java:289) ~[launcher_mcpatched.jar:?]
at net.minecraft.launcher.game.MinecraftGameRunner.launchGame(MinecraftGameRunner.java:177) ~[launcher_mcpatched.jar:?]
at com.mojang.launcher.game.runner.AbstractGameRunner.onDownloadJobFinished(AbstractGameRunner.java:185) [launcher_mcpatched.jar:?]
at com.mojang.launcher.updater.download.DownloadJob.popAndDownload(DownloadJob.java:122) [launcher_mcpatched.jar:?]
at com.mojang.launcher.updater.download.DownloadJob.access$000(DownloadJob.java:12) [launcher_mcpatched.jar:?]
at com.mojang.launcher.updater.download.DownloadJob$1.run(DownloadJob.java:86) [launcher_mcpatched.jar:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.7.0_65]
at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.7.0_65]
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [?:1.7.0_65]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [?:1.7.0_65]
at java.lang.Thread.run(Unknown Source) [?:1.7.0_65]