V4.A Dingo Install Issue (Crash on Launch)

[Lachy474]

Hey there

After trying to install the new version manually, many, many times, I can't get it to work. The game crashes instantly on launch. This never happened to me on previous versions, which all worked perfectly. Yes, its on a fresh install of mincraft. Help me, I wanna start a new world :(
Thanks in advance

Spoiler

Show

Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release
Sep 29, 2015 3:02:57 AM net.minecraft.launchwrapper.LogWrapper log
INFO: Using tweak class name net.minecraft.launchwrapper.VanillaTweaker
Sep 29, 2015 3:02:58 AM net.minecraft.launchwrapper.LogWrapper log
SEVERE: Unable to launch
java.lang.ClassNotFoundException: net.minecraft.client.Minecraft
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:179)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:53)
at net.minecraft.launchwrapper.Launch.main(Launch.java:18)
Caused by: java.lang.NullPointerException
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:171)
... 6 more

If you need any other info, let me know.

EDIT: using OSX 10.9.1, Launcher 1.6.44 :]

[Gilberreke]

Are you using Minecraft version 1.5.2?

[Lachy474]

Yes.

[FlowerChild]

Install instructions can be found in the readme with the mod download. If you're used to the old launcher, then the install method differs quite radically.

I'd advise reviewing those step by step to verify that you're installing the mod correctly.