java.lang.AssertionError: CloneableEditorSupport.getOpenedPanes() must be called from AWT thread only
   at org.openide.text.CloneableEditorSupport.getOpenedPanes(CloneableEditorSupport.java:1192)
   at org.netbeans.modules.xml.wsdl.ui.netbeans.module.WSDLEditorSupport.open(WSDLEditorSupport.java:155)
   at org.openide.windows.CloneableOpenSupport.edit(CloneableOpenSupport.java:121)
   at org.netbeans.modules.project.ui.ProjectUtilities$1.open(ProjectUtilities.java:116)
   at org.netbeans.modules.project.ui.ProjectUtilities.openProjectFiles(ProjectUtilities.java:537)
   at org.netbeans.modules.project.ui.OpenProjectList$21.run(OpenProjectList.java:1302)
Caused: org.openide.util.RequestProcessor$SlowItem: task failed due to: java.lang.AssertionError: CloneableEditorSupport.getOpenedPanes() must be called from AWT thread only
   at org.openide.util.RequestProcessor.post(RequestProcessor.java:424)
   at org.netbeans.modules.project.ui.OpenProjectList.doOpenProject(OpenProjectList.java:1300)
   at org.netbeans.modules.project.ui.OpenProjectList.open(OpenProjectList.java:790)
   at org.netbeans.modules.project.ui.OpenProjectList$5.run(OpenProjectList.java:658)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1454)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2036)