[1.7.2]Forge Gradle Crash

So I'm gonna update my mod to 1.7, I installed the Forge src, loaded everything up in Eclipse, and I looks fine. But, the minecraft folder has an exclamation point on it, and Forge crashes. I haven't installed anything else yet.

Error:

[11:40:23] [main/INFO]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker
[11:40:23] [main/ERROR]: Unable to launch
java.lang.ClassNotFoundException: cpw.mods.fml.common.launcher.FMLTweaker
at java.net.URLClassLoader$1.run(URLClassLoader.java:202) ~[?:1.6.0_65]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.6.0_65]
at java.net.URLClassLoader.findClass(URLClassLoader.java:190) ~[?:1.6.0_65]
at java.lang.ClassLoader.loadClass(ClassLoader.java:306) ~[?:1.6.0_65]
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) ~[?:1.6.0_65]
at java.lang.ClassLoader.loadClass(ClassLoader.java:247) ~[?:1.6.0_65]
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:104) ~[launchwrapper-1.9.jar:?]
at java.lang.ClassLoader.loadClass(ClassLoader.java:306) ~[?:1.6.0_65]
at java.lang.ClassLoader.loadClass(ClassLoader.java:247) ~[?:1.6.0_65]
at java.lang.Class.forName0(Native Method) ~[?:1.6.0_65]
at java.lang.Class.forName(Class.java:249) ~[?:1.6.0_65]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:97) [launchwrapper-1.9.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.9.jar:?]

Any idea as to what I'm doing wrong?

This looks very scary...

BTW: I'm sorry if this is in the wrong section, I couldn't decide...