Minecraft Launcher Error

Bootstrap started
Looking for update
Downloading: https://s3.amazonaws.com/Minecraft.Download/launcher/launcher.pack.lzma
Got reply in: 1560ms
Didn't find an update in time.
Reversing LZMA on C:\Users\Robert\AppData\Roaming\.minecraft\launcher.pack.lzma to C:\Users\Robert\AppData\Roaming\.minecraft\launcher.pack
Unpacking C:\Users\Robert\AppData\Roaming\.minecraft\launcher.pack to C:\Users\Robert\AppData\Roaming\.minecraft\launcher.jar
Downloaded 101.8kb in 0s at 212.7kb/s
Cleaning up C:\Users\Robert\AppData\Roaming\.minecraft\launcher.pack
Starting launcher.
FATAL ERROR: net.minecraft.bootstrap.FatalBootstrapError: Unable to start: java.lang.NoSuchMethodException: net.minecraft.launcher.Launcher.<init>(javax.swing.JFrame, java.io.File, java.net.Proxy, java.net.PasswordAuthentication, [Ljava.lang.String;, java.lang.Integer)
	at net.minecraft.bootstrap.Bootstrap.startLauncher(Bootstrap.java:228)
	at net.minecraft.bootstrap.Bootstrap.execute(Bootstrap.java:112)
	at net.minecraft.bootstrap.Bootstrap.main(Bootstrap.java:367)


Please fix the error and restart.