help this error does not let me create my server with mods

because when i put
  java -Xmx2048M -Xms2048M -jar forge.jar nogui
I get the error
A problem occurred running the Server launcher.java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:70)
        at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:34)
Caused by: java.lang.NoClassDefFoundError: com/google/common/collect/Lists
        at net.minecraftforge.fml.common.launcher.FMLTweaker.acceptOptions(FMLTweaker.java:69)
        at net.minecraftforge.fml.common.launcher.FMLServerTweaker.acceptOptions(FMLServerTweaker.java:36)
        at net.minecraft.launchwrapper.Launch.launch(Launch.java:114)
        at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
        ... 6 more
Caused by: java.lang.ClassNotFoundException: com.google.common.collect.Lists
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        ... 10 more
because when i put
  java -Xmx2048M -Xms2048M -jar forge.jar nogui
I get the error
There was a problem running Server launcher.java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethod)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        in java.lang.reflect.Method.invoke (unknown source)
        at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:70)
        at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:34)
Caused by: java.lang.NoClassDefFoundError: com/google/common/collect/Lists
        at net.minecraftforge.fml.common.launcher.FMLTweaker.acceptOptions(FMLTweaker.java:69)
        at net.minecraftforge.fml.common.launcher.FMLServerTweaker.acceptOptions(FMLServerTweaker.java:36)
        at net.minecraft.launchwrapper.Launch.launch(Launch.java:114)
        at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
        ... 6 more
Caused by: java.lang.ClassNotFoundException: com.google.common.collect.Lists
        at java.net.URLClassLoader.findClass (unknown source)
        in java.lang.ClassLoader.loadClass (unknown source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown source)
        in java.lang.ClassLoader.loadClass (unknown source)
        ... 10 more
Press a key to continue. . .

Please does anyone know the solution to this?