Fatal: Launch Error: Could not launch JNLP file. The application has not been initialized

[MarpleA]

I am trying to run a jnlp file to access my server's IPMI KVM. But unfortunately I get an error message.

net.sourceforge.jnlp.LaunchException: Fatal: Launch Error: Could not launch JNLP file. The application has not been initialized, for more information execute javaws/browser from the command line and send a bug report. at net.sourceforge.jnlp.Launcher.launchApplication(Launcher.java:414) at net.sourceforge.jnlp.Launcher.access$300(Launcher.java:72) at net.sourceforge.jnlp.Launcher$TgThread.run(Launcher.java:661) Caused by: java.lang.reflect.InvocationTargetException at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:118) at java.base/java.lang.reflect.Method.invoke(Method.java:580) at net.sourceforge.jnlp.Launcher.launchApplication(Launcher.java:407) ... 2 more Caused by: java.lang.ExceptionInInitializerError at com.ami.kvm.jviewer.JViewer.redirect(JViewer.java:277) at com.ami.kvm.jviewer.JViewer.main(JViewer.java:157) at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) ... 4 more Caused by: java.lang.IndexOutOfBoundsException: Index -1 out of bounds for length 18 at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:100) at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:106) at java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:302) at java.base/java.util.Objects.checkIndex(Objects.java:385) at java.base/java.util.ArrayList.get(ArrayList.java:427) at com.ami.kvm.jviewer.gui.StandAloneConnectionDialog.getSupportedLocales(StandAloneConnectionDialog.java:1599) at com.ami.kvm.jviewer.gui.JVMenu.constructOptionsMenu(JVMenu.java:1399) at com.ami.kvm.jviewer.gui.WindowMenu.constructUserIf(WindowMenu.java:65) at com.ami.kvm.jviewer.gui.WindowMenu.<init>(WindowMenu.java:43) at com.ami.kvm.jviewer.gui.WindowFrame.constructUserIf(WindowFrame.java:196) at com.ami.kvm.jviewer.gui.WindowFrame.<init>(WindowFrame.java:56) at com.ami.kvm.jviewer.gui.JViewerApp.constructUI(JViewerApp.java:856) at com.ami.kvm.jviewer.gui.JViewerApp.<init>(JViewerApp.java:848) at com.ami.kvm.jviewer.gui.JViewerApp.<clinit>(JViewerApp.java:696) ... 7 more

Executing javaws -browser as recommended results in another error message

Any ideas?