FYI: kafka noob here

I downloaded Offset Explorer 2 (Kafka Tool) on my Mac and when I open it, it shows up in my Activity Monitor for a few seconds and then closed. No UI appears and there is no error message displayed.

However, I was able to see the error log:

...
ERROR com.kafkatool.ui.MainApp - Error starting main application
java.lang.NullPointerException
    at java.awt.Window.init(Window.java:497)
    at java.awt.Window.<init>(Window.java:537)
    at java.awt.Frame.<init>(Frame.java:420)
    at java.awt.Frame.<init>(Frame.java:385)
    at javax.swing.JFrame.<init>(JFrame.java:189)
    at com.kafkatool.ui.MainFrame.<init>(MainFrame.java:97)
    at com.kafkatool.ui.MainApp.<init>(MainApp.java:33)
    at com.kafkatool.ui.MainApp.main(MainApp.java:110)
    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 com.exe4j.runtime.LauncherEngine.launch(LauncherEngine.java:84)
    at com.install4j.runtime.launcher.MacLauncher.main(MacLauncher.java:52)

What I have tried:

• Uninstalling/Reinstalling
• I tried installing via HomeBrew
• I tried installing via downloading it form the official site
• I tried uninstalling/reinstalling different version of Java (openJDK and the name-brand stuff)
• rebooting

None of the above seems to have any affect. I still see the same error message in the log