How to run testng.xml from Command Prompt using org.testng.TestNG

How to run testng.xml from Command Prompt using org.testng.TestNG

I am trying to run testng.xml from command prompt. This is the command I'm
running:
C:\Users\sathmakur>java -cp
C:\Users\sathmakur.m2\repository\org\testng\testng\ 6.3.1\testng-6.3.1.jar
org.testng.TestNG test.xml
I get the following error: Exception in thread "main"
java.lang.NoClassDefFoundError: com/beust/jcommander/ ParameterException
at java.lang.Class.getDeclaredMethods0(Native Method) at
java.lang.Class.privateGetDeclaredMethods(Unknown Source) at
java.lang.Class.getMethod0(Unknown Source) at
java.lang.Class.getMethod(Unknown Source) at
sun.launcher.LauncherHelper.getMainMethod(Unknown Source) at
sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source) Caused by:
java.lang.ClassNotFoundException: com.beust.jcommander.ParameterExcep tion
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) ... 6 more
I'm new at using TestNG and Command Prompt. It would be a great help if
someone could shed some light.