java.lang.AssertionError: BaseKit.install() incorrectly called from non-AWT thread.
        at org.netbeans.editor.BaseKit.install(BaseKit.java:494)
        at org.netbeans.modules.xml.text.syntax.XMLKit.install(XMLKit.java:93)
        at javax.swing.JEditorPane.setEditorKit(JEditorPane.java:959)
        at org.openide.text.CloneableEditor.initialize(CloneableEditor.java:212)
        at org.openide.text.CloneableEditor.getEditorPane(CloneableEditor.java:630)
        at org.openide.text.CloneableEditorSupport.getOpenedPanes(CloneableEditorSupport.java:835)
        at org.apache.tools.ant.module.xml.AntProjectSupport.createInputSource(AntProjectSupport.java:218)
        at org.apache.tools.ant.module.xml.AntProjectSupport.parseDocument(AntProjectSupport.java:270)
        at org.apache.tools.ant.module.xml.AntProjectSupport.getDocument(AntProjectSupport.java:149)
        at org.apache.tools.ant.module.xml.AntProjectSupport.getProjectElement(AntProjectSupport.java:304)
        at org.apache.tools.ant.module.api.support.TargetLister$Script.<init>(TargetLister.java:257)
        at org.apache.tools.ant.module.api.support.TargetLister$Script.interpretTasks(TargetLister.java:377)
        at org.apache.tools.ant.module.api.support.TargetLister$Script.<init>(TargetLister.java:300)
        at org.apache.tools.ant.module.api.support.TargetLister.getTargets(TargetLister.java:87)
        at org.apache.tools.ant.module.nodes.AntProjectChildren.refreshKeys(AntProjectChildren.java:64)
        at org.apache.tools.ant.module.nodes.AntProjectChildren.stateChanged(AntProjectChildren.java:99)
        at org.apache.tools.ant.module.xml.AntProjectSupport$ChangeFirer.run(AntProjectSupport.java:384)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:471)
[catch] at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:904)