Example file picker does not work

[Daniel99j2]

When using the file picker:
@entry(category = FILE,
selectionMode = JFileChooser.FILES_ONLY,
fileExtensions = {"json", "txt", "log"}, // Define valid file extensions
fileChooserType = JFileChooser.SAVE_DIALOG,
name = "I am a file!")
public static String myFile = ""; // The isFile property adds a file picker button
When pressing on the folder button, it does not open and there is an error:
[09:03:08] [Thread-20/ERROR] (FabricLoader) Uncaught exception in thread "Thread-20"
java.awt.HeadlessException: null
at java.desktop/java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:164) ~[?:?]
at java.desktop/java.awt.Window.(Window.java:553) ~[?:?]
at java.desktop/java.awt.Frame.(Frame.java:428) ~[?:?]
at java.desktop/java.awt.Frame.(Frame.java:393) ~[?:?]
at java.desktop/javax.swing.SwingUtilities$SharedOwnerFrame.(SwingUtilities.java:1925) ~[?:?]
at java.desktop/javax.swing.SwingUtilities.getSharedOwnerFrame(SwingUtilities.java:2001) ~[?:?]
at java.desktop/javax.swing.JOptionPane.getRootFrame(JOptionPane.java:1696) ~[?:?]
at java.desktop/javax.swing.JOptionPane.getWindowForComponent(JOptionPane.java:1637) ~[?:?]
at java.desktop/javax.swing.JFileChooser.createDialog(JFileChooser.java:815) ~[?:?]
at java.desktop/javax.swing.JFileChooser.showDialog(JFileChooser.java:762) ~[?:?]
at eu.midnightdust.lib.config.MidnightConfig$MidnightConfigScreen.lambda$fillList$11(MidnightConfig.java:366) ~[midnightlib-1.6.3-fabric.jar:?]
at java.base/java.lang.Thread.run(Thread.java:1583) [?:?]

Fabric version:
0.16.7 and 0.106.0+1.21.1
Midnight version:
1.6.3-fabric
Mc version:
1.21.1 Fabric