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java.lang.AssertionError: Projects can't be null	at org.netbeans.modules.project.ui.OpenProjectList.doOpen(OpenProjectList.java:232)	at org.netbeans.modules.project.ui.OpenProjectList.open(OpenProjectList.java:208)	at org.netbeans.modules.project.ui.OpenProjectList.open(OpenProjectList.java:160)	at org.netbeans.modules.project.ui.OpenProjectsTrampolineImpl.openAPI(OpenProjectsTrampolineImpl.java:43)	at org.netbeans.api.project.ui.OpenProjects.open(OpenProjects.java:92)	at org.netbeans.modules.projectimport.eclipse.ImportProjectAction$1.actionPerformed(ImportProjectAction.java:93)	at javax.swing.Timer.fireActionPerformed(Timer.java:271)	at javax.swing.Timer$DoPostEvent.run(Timer.java:201)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:153)	at java.awt.Dialog$1.run(Dialog.java:515)	at java.awt.Dialog.show(Dialog.java:536)	at org.netbeans.core.windows.services.NbPresenter.superShow(NbPresenter.java:800)	at org.netbeans.core.windows.services.NbPresenter.doShow(NbPresenter.java:843)	at org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:831)	at org.openide.util.Mutex.doEventAccess(Mutex.java:1146)	at org.openide.util.Mutex.readAccess(Mutex.java:183)	at org.netbeans.core.windows.services.NbPresenter.show(NbPresenter.java:816)	at java.awt.Component.show(Component.java:1300)	at java.awt.Component.setVisible(Component.java:1253)	at org.netbeans.modules.projectimport.eclipse.ImportProjectAction.performAction(ImportProjectAction.java:102)	at org.openide.util.actions.CallableSystemAction$1.run(CallableSystemAction.java:94)	at org.netbeans.modules.openide.util.ActionsBridge.doPerformAction(ActionsBridge.java:47)	at org.openide.util.actions.CallableSystemAction.actionPerformed(CallableSystemAction.java:90)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849)	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2169)	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)	at javax.swing.AbstractButton.doClick(AbstractButton.java:302)	at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:1000)	at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:1041)	at java.awt.Component.processMouseEvent(Component.java:5488)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3126)	at java.awt.Component.processEvent(Component.java:5253)	at java.awt.Container.processEvent(Container.java:1966)	at java.awt.Component.dispatchEventImpl(Component.java:3955)	at java.awt.Container.dispatchEventImpl(Container.java:2024)	at java.awt.Component.dispatchEvent(Component.java:3803)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3892)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)	at java.awt.Container.dispatchEventImpl(Container.java:2010)	at java.awt.Window.dispatchEventImpl(Window.java:1774)	at java.awt.Component.dispatchEvent(Component.java:3803)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)