Unable to Launch

Client> Exception in thread "main" joptsimple.MissingRequiredOptionException: Missing Required option (s) ['version']
Client> at joptsimple.OptionParser.ensureRequiredOptions(Optionparser.java:399)
Client> at joptsimple.Optionparser.parse(OptionpParser.java:389)
Client> at net.minecraft.client.main.Main(SourceFIle:36)
Game ended with bad state (exit code 1)
Deleting c:\Users\Nathan\Appdata\Roaming\.minecraft\versions\13w23a\13w23a-natives-1239553479038
What I thought was going to happen didnt i thought that the game would launch fine. What happend was the error code above