Glassfish from myeclipse is throwing exception

[VenkataPrasad Regula]

As i start glassfish from myeclipse I am getting the following error. Can someone please kindly look into it.

Exception in thread "main" java.lang.NoClassDefFoundError: com/sun/enterprise/glassfish/bootstrap/ASMain
Caused by: java.lang.ClassNotFoundException: com.sun.enterprise.glassfish.bootstrap.ASMain
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: com.sun.enterprise.glassfish.bootstrap.ASMain. Program will exit.