Basically I've switched over to a new computer with the same eclipse and source, however the client won't run in eclipse. I've been trying for the past month to fix this on my own, but since my mod has been delayed so long I figured some help might not hurt. Any ideas?

How about some screenshots and anything else that may help us, considering we aren't you and we have no idea what you're talking about?

My apologies here's the crash log: Note this is vanilla and without my mod

Possibly a Java problem, any advice would help thanks

 

Apr 12, 2014 6:02:40 PM net.minecraft.launchwrapper.LogWrapper log

INFO: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker

Apr 12, 2014 6:02:40 PM net.minecraft.launchwrapper.LogWrapper log

SEVERE: Unable to launch

java.lang.ClassNotFoundException: cpw.mods.fml.common.launcher.FMLTweaker

at java.net.URLClassLoader$1.run(Unknown Source)

at java.net.URLClassLoader$1.run(Unknown Source)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:102)

at java.lang.ClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at java.lang.Class.forName0(Native Method)

at java.lang.Class.forName(Unknown Source)

at net.minecraft.launchwrapper.Launch.launch(Launch.java:94)

at net.minecraft.launchwrapper.Launch.main(Launch.java:27)

 

 

It's saying it can't find FML. You probably didn't install the Forge source correctly. Can you open the Minecraft source? What build number of Forge do you have?

The forge build I used for that was:

 

Build 1.6.4-9.11.1.964

 

EDIT: Right now I'm going to try to set up a 1.7.2 Work-Space with version 10.12.0.1024 and see if that works and I'll continue from there.