When I try to launch the JAR or to execute Lexi.java, I get an exception:
Exception in thread "main" java.lang.ClassCastException: javax.swing.plaf.synth.SynthDesktopPaneUI$SynthDesktopManager cannot be cast to com.jmonkey.office.lexi.DocumentManager
at com.jmonkey.office.lexi.Lexi.getDesktopManager(Lexi.java:711)
at com.jmonkey.office.lexi.Lexi.createMenuBar(Lexi.java:491)
at...
