Exception in thread "main" java.lang.NoClassDefFoundError: AplicacionCorreo/clas
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Caused by: java.lang.ClassNotFoundException: AplicacionCorreo.class
        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
Could not find the main class: AplicacionCorreo.class.  Program will exit.