VPS Trouble

Could someone help me out?  

Exception in thread "main" java.lang.ExceptionInInitializerError
        at org.pushingpixels.substance.internal.contrib.jgoodies.looks.common.Sh                                                                                        adowPopupFactory.install(ShadowPopupFactory.java:115)
        at org.pushingpixels.substance.api.SubstanceLookAndFeel.initialize(Subst                                                                                        anceLookAndFeel.java:1781)
        at javax.swing.UIManager.setLookAndFeel(UIManager.java:538)
        at org.pushingpixels.substance.api.SubstanceLookAndFeel.setSkin(Substanc                                                                                        eLookAndFeel.java:2163)
        at org.pushingpixels.substance.api.SubstanceLookAndFeel.access$000(Subst                                                                                        anceLookAndFeel.java:92)
        at org.pushingpixels.substance.api.SubstanceLookAndFeel$3.run(SubstanceL                                                                                        ookAndFeel.java:2136)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:301)
        at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)
        at java.awt.EventQueue.access$500(EventQueue.java:97)
        at java.awt.EventQueue$3.run(EventQueue.java:709)
        at java.awt.EventQueue$3.run(EventQueue.java:703)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionP                                                                                        rivilege(ProtectionDomain.java:76)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThre                                                                                        ad.java:201)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.                                                                                        java:116)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre                                                                                        ad.java:105)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
Caused by: java.awt.HeadlessException:
No X11 DISPLAY variable was set, but this program performed an operation which r                                                                                        equires it.
        at sun.awt.HeadlessToolkit.getScreenResolution(HeadlessToolkit.java:226)
        at org.pushingpixels.lafwidget.utils.LookUtils.isLowResolution(LookUtils                                                                                        .java:435)
        at org.pushingpixels.lafwidget.utils.LookUtils.<clinit>(LookUtils.java:2                                                                                        33)
        ... 20 more

root@WelloffUneven-VM:~/Desktop# java -version
java version "1.8.0_101"
Java(TM) SE Runtime Environment (build 1.8.0_101-b13)
Java HotSpot(TM) Server VM (build 25.101-b13, mixed mode)

thanks in advance

Fixed it:

Set permissions to execute - everyone.

If anyone runs into the same issue.