some one can help me ??? can't start this on Centos

some one can help me ??? can't start this on Centos

I have installed Appmanager on my server but i can't start this when running command :
./startWebconsole.sh 
and i see the problem 

No X11 DISPLAY variable was set, but this program performed an operation which requires it.
java.awt.HeadlessException:
No X11 DISPLAY variable was set, but this program performed an operation which requires it.
        at java.awt.GraphicsEnvironment.checkHeadless(Unknown Source)
        at java.awt.Window.<init>(Unknown Source)
        at java.awt.Frame.<init>(Unknown Source)
        at java.awt.Frame.<init>(Unknown Source)
        at javax.swing.JFrame.<init>(Unknown Source)
        at com.installshield.wizard.swing.SwingWizardUI.createFrame(SwingWizardUI.java:371)
        at com.installshield.wizard.awt.AWTWizardUI.initialize(AWTWizardUI.java:599)
        at com.installshield.wizard.swing.SwingWizardUI.initialize(SwingWizardUI.java:245)
        at com.installshield.wizard.StandardWizardListener.wizardInitializing(StandardWizardListener.java:25)
        at com.installshield.wizard.Wizard$WizardListenerInitializer.run(Wizard.java:1614)
        at java.lang.Thread.run(Unknown Source)
The installer is unable to run in graphical mode. Try running the installer with the -console or -silent flag.
(Aug 6, 2015 11:22:32 PM), Install, com.installshield.wizard.StandardWizardListener, err, could not initialize interface swing
Wizard.getExitCode(): called after WizardServices is shutdown.
Wizard.getExitCode(): called after WizardServices is shutdown.

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