Ayuda Con Applet!!!!

Hola, intento cargar un JApplet pero no me monta la interfaz y me arroja el
siguiente error.

java.security.AccessControlException: access denied
(java.lang.RuntimePermission getenv.KDE_FULL_SESSION)
 at java.security.AccessControlContext.checkPermission(Unknown Source)
 at java.security.AccessController.checkPermission(Unknown Source)
 at java.lang.SecurityManager.checkPermission(Unknown Source)
 at java.lang.System.getenv(Unknown Source)
 at
org.jvnet.substance.fonts.DefaultKDEFontPolicy.isKDERunning(DefaultKDEFontPolicy.java:51)
 at
org.jvnet.substance.fonts.SubstanceFontUtilities.getDefaultFontPolicy(SubstanceFontUtilities.java:207)
 at
org.jvnet.substance.SubstanceLookAndFeel.getFontPolicy(SubstanceLookAndFeel.java:3489)
 at
org.jvnet.substance.SubstanceLookAndFeel.initFontDefaults(SubstanceLookAndFeel.java:3499)
 at
org.jvnet.substance.SubstanceLookAndFeel.initComponentDefaults(SubstanceLookAndFeel.java:3341)
 at javax.swing.plaf.basic.BasicLookAndFeel.getDefaults(Unknown Source)
 at
org.jvnet.substance.SubstanceLookAndFeel.getDefaults(SubstanceLookAndFeel.java:3630)
 at javax.swing.UIManager.setLookAndFeel(Unknown Source)
 at javax.swing.UIManager.setLookAndFeel(Unknown Source)
 at views.UIMain.<init>(UIMain.java:22)
 at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
 at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
 at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown
Source)
 at java.lang.reflect.Constructor.newInstance(Unknown Source)
 at java.lang.Class.newInstance0(Unknown Source)
 at java.lang.Class.newInstance(Unknown Source)
 at sun.applet.AppletPanel.createApplet(Unknown Source)
 at sun.plugin.AppletViewer.createApplet(Unknown Source)
 at sun.applet.AppletPanel.runLoader(Unknown Source)
 at sun.applet.AppletPanel.run(Unknown Source)
 at java.lang.Thread.run(Unknown Source)

Agradezco mucho su ayuda.

-- 
Leonardo Betancourt Teran
ερευνα e-bussines solutions
Tel.: 3008056967
Cartagena - Colombia