bModel Test's strange performance under different operating systems

[azure CC]

Hello everyone. I meet a knotty problem when I perform bModelTest under BEAST2. The identical data set is running normally on my laptop's windows system. But when running on CentOS 7.0,  the program was aborted and report errors. The windows system installed Beast2 version is v2.6.6, and the CentOS system version is v2.6.4. CentOS can run Gamma site model.

The error information is like this:

java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at  sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at beast.app.beastapp.BeastLauncher.run(Unknown Source)
        at beast.app.beastapp.BeastLauncher.main(Unknown Source)
Caused by: java.awt.HeadlessException:
No X11 DISPLAY variable was set, but this program performed an operation which requires it.
        at java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:204)
        at java.awt.Window.<init>(Window.java:536)
        at java.awt.Frame.<init>(Frame.java:420)
        at java.awt.Frame.<init>(Frame.java:385)
        at javax.swing.SwingUtilities$SharedOwnerFrame.<init>(SwingUtilities.java:1763)
        at javax.swing.SwingUtilities.getSharedOwnerFrame(SwingUtilities.java:1838)
        at javax.swing.JOptionPane.getRootFrame(JOptionPane.java:1696)
        at javax.swing.JOptionPane.getWindowForComponent(JOptionPane.java:1637)
        at javax.swing.JFileChooser.createDialog(JFileChooser.java:802)
        at javax.swing.JFileChooser.showDialog(JFileChooser.java:749)
        at javax.swing.JFileChooser.showOpenDialog(JFileChooser.java:656)
        at beast.app.beastapp.BeastMain.getFileNameByDialog(Unknown Source)
        at beast.app.beastapp.BeastMain.main(Unknown Source)
        ... 6 more