java.lang.AssertionError: org.openide.loaders.DataObjectNotFoundException: MasterFileObject@122a59e[space/netbeans/trunk/nb_all/db/core/nbproject/project.properties]
        at org.netbeans.modules.apisupport.project.ui.ModuleLogicalView.findPath(ModuleLogicalView.java:99)
        at org.netbeans.modules.project.ui.ProjectsRootNode.findNode(ProjectsRootNode.java:144)
        at org.netbeans.modules.project.ui.ProjectTab$1.run(ProjectTab.java:326)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:541)
[catch] at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:963)
Caused by: org.openide.loaders.DataObjectNotFoundException: MasterFileObject@122a59e[space/netbeans/trunk/nb_all/db/core/nbproject/project.properties]
        at org.openide.loaders.DataObject.find(DataObject.java:469)
        at org.netbeans.modules.apisupport.project.ui.ModuleLogicalView.findPath(ModuleLogicalView.java:97)
        ... 4 more
Caused by: org.openide.filesystems.FileStateInvalidException: MasterFileObject@122a59e[space/netbeans/trunk/nb_all/db/core/nbproject/project.properties]
        at org.openide.loaders.DataObject.find(DataObject.java:449)
        ... 5 more