Put the summary of the bug you're having here

*What I expected to happen was...:
Loading the game normally

What actually happened was...:
(Heres what I caught.)
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(OptionParser.java:389)
Client> at net.minecraft.client.main.Main.main(SourceFile:36)
Game ended with bad state (exit code 1)
Deleting C:\Users\Molly\AppData\Roaming\.minecraft\versions\13w23a\13w23a-natives-160720551266228
Couldn't delete C:\Users\Molly\AppData\Roaming\.minecraft\versions\13w23a\13w23a-natives-160720551266228 - scheduling for deletion upon exit

Steps to Reproduce:
1. Start game.
2. This bug occured. I do not know.

(I also did just download the launcher from the Mojang page. I want to play my minecraft!)

--Nevermind. I was using a 0.7.1 launcher. But how..? I just downloaded it and ran it, ???