java.util.ConcurrentModificationException
        at java.util.Hashtable$Enumerator.next(Hashtable.java:1031)
        at java.util.AbstractCollection.addAll(AbstractCollection.java:305)
        at java.util.HashSet.<init>(HashSet.java:100)
        at com.sun.java.swing.plaf.nimbus.NimbusStyle.validate(NimbusStyle.java:230)
        at com.sun.java.swing.plaf.nimbus.NimbusStyle.getValues(NimbusStyle.java:777)
        at com.sun.java.swing.plaf.nimbus.NimbusStyle.getInsets(NimbusStyle.java:453)
        at javax.swing.plaf.synth.SynthStyle.installDefaults(SynthStyle.java:896)
        at javax.swing.plaf.synth.SynthLookAndFeel.updateStyle(SynthLookAndFeel.java:276)
        at javax.swing.plaf.synth.SynthPanelUI.updateStyle(SynthPanelUI.java:70)
        at javax.swing.plaf.synth.SynthPanelUI.installDefaults(SynthPanelUI.java:57)
        at javax.swing.plaf.basic.BasicPanelUI.installUI(BasicPanelUI.java:39)
        at javax.swing.plaf.synth.SynthPanelUI.installUI(SynthPanelUI.java:37)
        at javax.swing.JComponent.setUI(JComponent.java:673)
        at javax.swing.JPanel.setUI(JPanel.java:136)
        at javax.swing.JPanel.updateUI(JPanel.java:109)
        at javax.swing.JPanel.<init>(JPanel.java:69)
        at javax.swing.JPanel.<init>(JPanel.java:92)
        at javax.swing.JPanel.<init>(JPanel.java:100)
        at org.netbeans.modules.vmd.midp.propertyeditors.api.usercode.PropertyEditorUserCode$CustomEditor.<init>(PropertyEditorUserCode.java:289)
        at org.netbeans.modules.vmd.midp.propertyeditors.api.usercode.PropertyEditorUserCode$CustomEditor.<init>(PropertyEditorUserCode.java:289)
        at org.netbeans.modules.vmd.midp.propertyeditors.api.usercode.PropertyEditorUserCode.<init>(PropertyEditorUserCode.java:102)
        at org.netbeans.modules.vmd.midp.propertyeditors.PropertyEditorBooleanUC.<init>(PropertyEditorBooleanUC.java:81)
        at org.netbeans.modules.vmd.midp.propertyeditors.PropertyEditorBooleanUC.createInstance(PropertyEditorBooleanUC.java:103)
        at org.netbeans.modules.vmd.midpnb.components.displayables.SplashScreenCD.createPropertiesPresenter(SplashScreenCD.java:103)
        at org.netbeans.modules.vmd.midpnb.components.displayables.SplashScreenCD.createPresenters(SplashScreenCD.java:123)
        at org.netbeans.modules.vmd.api.model.ComponentDescriptor.gatherPresenters(ComponentDescriptor.java:161)
        at org.netbeans.modules.vmd.api.model.DesignComponent.gatherPresenters(DesignComponent.java:147)
        at org.netbeans.modules.vmd.api.model.DesignComponent.setComponentDescriptor(DesignComponent.java:134)
        at org.netbeans.modules.vmd.api.model.DesignComponent.<init>(DesignComponent.java:96)
        at org.netbeans.modules.vmd.api.model.DesignDocument.createRawComponent(DesignDocument.java:224)
        at org.netbeans.modules.vmd.io.DocumentLoad.loadDocumentCore(DocumentLoad.java:186)
        at org.netbeans.modules.vmd.io.DocumentLoad.access$000(DocumentLoad.java:71)
        at org.netbeans.modules.vmd.io.DocumentLoad$1.run(DocumentLoad.java:149)
        at org.netbeans.modules.vmd.api.model.TransactionManager.writeAccessCore(TransactionManager.java:120)
        at org.netbeans.modules.vmd.api.model.TransactionManager.access$100(TransactionManager.java:60)
        at org.netbeans.modules.vmd.api.model.TransactionManager$2$1.run(TransactionManager.java:103)
        at org.openide.util.Mutex.writeAccess(Mutex.java:469)
        at org.netbeans.modules.vmd.api.model.TransactionManager$2.run(TransactionManager.java:101)
        at org.openide.util.Mutex.readAccess(Mutex.java:362)
        at org.netbeans.modules.vmd.api.model.DescriptorRegistry$2.run(DescriptorRegistry.java:121)
        at org.openide.util.Mutex.readAccess(Mutex.java:362)
        at org.netbeans.modules.vmd.api.model.GlobalDescriptorRegistry.readAccess(GlobalDescriptorRegistry.java:159)
        at org.netbeans.modules.vmd.api.model.DescriptorRegistry.readAccess(DescriptorRegistry.java:119)
        at org.netbeans.modules.vmd.api.model.TransactionManager.writeAccess(TransactionManager.java:99)
        at org.netbeans.modules.vmd.io.DocumentLoad.loadDocumentVersion1(DocumentLoad.java:146)
        at org.netbeans.modules.vmd.io.DocumentLoad.loadVersion1(DocumentLoad.java:102)
        at org.netbeans.modules.vmd.io.DocumentLoad.load(DocumentLoad.java:96)
        at org.netbeans.modules.vmd.api.io.providers.DocumentSerializer$1.run(DocumentSerializer.java:87)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:561)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:986)