Untitled

container@pterodactyl~ java -Xms128M -Xmx5120M -jar server.jar
JVM info: Oracle Corporation - 11.0.13 - 11.0.13+8
java.net.preferIPv4Stack=true
Found java version 11.0.13
Exception in thread "main" 
java.awt.HeadlessException: 
No X11 DISPLAY variable was set, but this program performed an operation which requires it.
        at java.desktop/java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:208)
        at java.desktop/java.awt.Window.<init>(Window.java:548)
        at java.desktop/java.awt.Frame.<init>(Frame.java:423)
        at java.desktop/java.awt.Frame.<init>(Frame.java:388)
        at java.desktop/javax.swing.SwingUtilities$SharedOwnerFrame.<init>(SwingUtilities.java:1919)
        at java.desktop/javax.swing.SwingUtilities.getSharedOwnerFrame(SwingUtilities.java:1995)
        at java.desktop/javax.swing.JOptionPane.getRootFrame(JOptionPane.java:1689)
        at java.desktop/javax.swing.JOptionPane.showOptionDialog(JOptionPane.java:868)
        at java.desktop/javax.swing.JOptionPane.showMessageDialog(JOptionPane.java:670)
        at java.desktop/javax.swing.JOptionPane.showMessageDialog(JOptionPane.java:641)
        at net.minecraftforge.installer.SimpleInstaller.launchGui(SimpleInstaller.java:177)
        at net.minecraftforge.installer.SimpleInstaller.main(SimpleInstaller.java:147)