The three errors are in the following classes:

 

TextureFXManager.java

 

private TextureHelper helper;

 

TextureStitched.java

 

    
public static void doTextureCopy(Texture atlas, Texture source, int targetX, int targetY)
    {
        TextureFXManager.instance().>>getHelper<<Error Here().doTextureCopy(atlas, source, targetX, targetY);        
    }

 

FMLRenderAccessLibrary.java

 

>>import net.minecraftforge.event.entity.living.LivingPackSizeEvent;<<Not found

 

and

 

    
public static int getMaxSpawnPackSize(EntityLiving entity)
    {
        >>LivingPackSizeEvent<<Error maxCanSpawnEvent = new >>LivingPackSizeEvent<<Error(entity);
        MinecraftForge.EVENT_BUS.post(maxCanSpawnEvent);
        return maxCanSpawnEvent.getResult() == Result.ALLOW ? maxCanSpawnEvent.maxPackSize : entity.getMaxSpawnedInChunk();
    }
}

 

The Error that comes up during decompile:

 

Delete your workspace and try again with unmodiefed/hackish stuff. The log clearly stated that the jars are modified.

And that code works fine.

So get yourself a clean copy and try again.