[NoClassDefFoundError]: Could not initialize class de.mendelson.util.clientserver.connectiontest.gui.JDialog... when trying to test a connection

Hi,

I get this error every time I try to test a connection, regardless of which http or https connection it is:
[NoClassDefFoundError]: Could not initialize class de.mendelson.util.clientserver.connectiontest.gui.JDialog...

I'm running Mendelson AS4 on Windows.
Any suggestions?

Regards Andreas

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AS4