Unable to launch Oracle forms over the internet (Thin Juniper VPN Client ) - lass oracle/apps/fnd/f

I am able to login through Self service but when i  launch Oracle forms over the internet (Thin Juniper VPN Client ) , Receive error belowPlease help.

basic: load: class oracle/apps/fnd/formsClient/FormsLauncher.class not found.
load: class oracle/apps/fnd/formsClient/FormsLauncher.class not found.
java.lang.ClassNotFoundException: oracle.apps.fnd.formsClient.FormsLauncher.class
	at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
	at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
	at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
	at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
	at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
	at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Exception: java.lang.ClassNotFoundException: oracle.apps.fnd.formsClient.FormsLauncher.class