java.lang.AssertionError: no <classpath> in [extra-compilation-unit: null]
	at org.netbeans.modules.apisupport.project.ClassPathProviderImpl.calculateExtraCompilationUnits(ClassPathProviderImpl.java:302)
	at org.netbeans.modules.apisupport.project.ClassPathProviderImpl.getProjectClassPaths(ClassPathProviderImpl.java:388)
	at org.netbeans.modules.apisupport.project.NbModuleProject$OpenedHook.projectOpened(NbModuleProject.java:780)
	at org.netbeans.spi.project.ui.ProjectOpenedHook$1.projectOpened(ProjectOpenedHook.java:50)
	at org.netbeans.modules.project.ui.OpenProjectList.notifyOpened(OpenProjectList.java:413)
	at org.netbeans.modules.project.ui.OpenProjectList.getDefault(OpenProjectList.java:126)
	at org.netbeans.modules.project.ui.OpenProjectsTrampolineImpl.<init>(OpenProjectsTrampolineImpl.java:35)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:494)
	at java.lang.Class.newInstance0(Class.java:350)
	at java.lang.Class.newInstance(Class.java:303)
	at org.openide.util.lookup.MetaInfServicesLookup$P.getInstance(MetaInfServicesLookup.java:406)
	at org.openide.util.lookup.AbstractLookup.lookup(AbstractLookup.java:325)
	at org.openide.util.lookup.ProxyLookup.lookup(ProxyLookup.java:145)
	at org.netbeans.modules.project.uiapi.Utilities.getOpenProjectsTrampoline(Utilities.java:45)
	at org.netbeans.api.project.ui.OpenProjects.<init>(OpenProjects.java:52)
	at org.netbeans.api.project.ui.OpenProjects.<clinit>(OpenProjects.java:47)
	at org.netbeans.modules.editor.bookmarks.EditorBookmarksModule.restored(EditorBookmarksModule.java:71)
	at org.netbeans.core.modules.NbInstaller.loadCode(NbInstaller.java:317)
	at org.netbeans.core.modules.NbInstaller.load(NbInstaller.java:235)
	at org.netbeans.core.modules.ModuleManager.enable(ModuleManager.java:871)
	at org.netbeans.core.modules.ModuleList.installNew(ModuleList.java:382)
	at org.netbeans.core.modules.ModuleList.trigger(ModuleList.java:316)
	at org.netbeans.core.modules.ModuleSystem.restore(ModuleSystem.java:248)
	at org.netbeans.core.NonGui.run(NonGui.java:356)
	at org.netbeans.core.Main.run(Main.java:185)