java.lang.IllegalArgumentException: No enum constant biz.ganttproject.core.calendar.CalendarEvent.Type.WORKING

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java.lang.IllegalArgumentException: No enum constant biz.ganttproject.core.calendar.CalendarEvent.Type.WORKING
at java.lang.Enum.valueOf(Enum.java:238)
at biz.ganttproject.core.calendar.CalendarEvent$Type.valueOf(CalendarEvent.java:39)
at net.sourceforge.ganttproject.parser.HolidayTagHandler.loadHoliday(HolidayTagHandler.java:117)
at net.sourceforge.ganttproject.parser.HolidayTagHandler.endElement(HolidayTagHandler.java:71)
at net.sourceforge.ganttproject.io.XmlParser.endElement(XmlParser.java:88)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(AbstractSAXParser.java:609)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(XMLDocumentFragmentScannerImpl.java:1783)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2970)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:606)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:848)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:643)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl.parse(SAXParserImpl.java:327)
at javax.xml.parsers.SAXParser.parse(SAXParser.java:195)
at net.sourceforge.ganttproject.io.XmlParser.parse(XmlParser.java:110)
at net.sourceforge.ganttproject.calendar.GPCalendarProvider.readCalendar(GPCalendarProvider.java:89)
at net.sourceforge.ganttproject.calendar.GPCalendarProvider.readCalendars(GPCalendarProvider.java:109)
at net.sourceforge.ganttproject.calendar.GPCalendarProvider.getInstance(GPCalendarProvider.java:129)
at net.sourceforge.ganttproject.gui.projectwizard.WeekendConfigurationPage.createCalendarOption(WeekendConfigurationPage.java:211)
at net.sourceforge.ganttproject.gui.projectwizard.WeekendConfigurationPage.(WeekendConfigurationPage.java:154)
at net.sourceforge.ganttproject.gui.projectwizard.NewProjectWizardWindow.addWeekendConfigurationPage(NewProjectWizardWindow.java:52)
at net.sourceforge.ganttproject.gui.projectwizard.NewProjectWizard.createNewProject(NewProjectWizard.java:33)
at net.sourceforge.ganttproject.gui.ProjectUIFacadeImpl.showNewProjectWizard(ProjectUIFacadeImpl.java:300)
at net.sourceforge.ganttproject.gui.ProjectUIFacadeImpl.createProject(ProjectUIFacadeImpl.java:295)
at net.sourceforge.ganttproject.GanttProject.newProject(GanttProject.java:600)
at net.sourceforge.ganttproject.action.project.NewProjectAction.actionPerformed(NewProjectAction.java:41)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.AbstractButton.doClick(AbstractButton.java:376)
at com.apple.laf.ScreenMenuItem.actionPerformed(ScreenMenuItem.java:125)
at java.awt.MenuItem.processActionEvent(MenuItem.java:669)
at java.awt.MenuItem.processEvent(MenuItem.java:628)
at java.awt.MenuComponent.dispatchEventImpl(MenuComponent.java:351)
at java.awt.MenuComponent.dispatchEvent(MenuComponent.java:339)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:761)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

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