Unable to play with dev launcher 0.9

I was playing Minecraft with the 0.8.3 launcher when the update happened, so I quit to download the new launcher. With the new launcher, I am unable to play, as the game will not launch no matter what version I select. I get the following in the console:

Client> Exception in thread "main" java.lang.NoClassDefFoundError: net/minecraft/client/main/Main
Client> Caused by: java.lang.ClassNotFoundException: net.minecraft.client.main.Main
Client> 	at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
Client> 	at java.security.AccessController.doPrivileged(Native Method)
Client> 	at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
Client> 	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
Client> 	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
Client> 	at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Game ended with bad state (exit code 1)
Deleting /Users/mgj4/Library/Application Support/minecraft/versions/13w23b/13w23b-natives-1370878580399315000