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How to start this program?

The error that comes up is: `Exception in thread "main" java.awt.HeadlessException at java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:204) at java.awt.Window.(Window.java:536) at java.awt.Frame.(Frame.java:420) at javax.swing.JFrame.(JFrame.java:233) at launcher.LoginForm.(LoginForm.java:20) at launcher.Main.checkIfLoggedIn(Main.java:61) at launcher.Main.(Main.java:55) at launcher.Main.main(Main.java:19) `