Minecraft broken cant fix

Hey I will sub to anyone who can answer my question...
I use magic launcher, and it wont let me on.
So I check my minecraft bin and see nothing there.
So I say "Ok Ill just force update to get a new one".
When I go to options It wont let me click the button.
Here is what it says when I log on-

*** MagicMinecraftLauncher 1.1.6 ***
LCP: ;/Users/user/Library/Application Support/minecraft/bin/minecraft.jar;bin/jinput.jar;bin/lwjgl.jar;bin/lwjgl_util.jar
MainClass: net.minecraft.client.Minecraft
java.lang.ClassNotFoundException: net.minecraft.client.Minecraft
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at magic.launcher.Launcher.main(Unknown Source)

Thanks to anyone who can solve this my computer is a Macbook Air. -Thanks