Core Exception: No property tester contributes a property org.eventb.ui.property.isEditable

[cfsnook]

Multiple exceptions are raised as below. Probably something has got deleted when re-generating for last release

!ENTRY org.eclipse.e4.ui.workbench 4 0 2020-11-17 12:34:29.581
!MESSAGE Failed to evaluate: ReferenceExpression [definitionId=fr.systerel.editor.definition.editableStructuralMode]
!STACK 0
org.eclipse.core.runtime.CoreException: No property tester contributes a property org.eventb.ui.property.isEditable to type class org.eclipse.emf.common.ui.URIEditorInput
at org.eclipse.core.internal.expressions.TypeExtensionManager.getProperty(TypeExtensionManager.java:130)
at org.eclipse.core.internal.expressions.TestExpression.evaluate(TestExpression.java:100)
at org.eclipse.core.internal.expressions.CompositeExpression.evaluateAnd(CompositeExpression.java:55)
at org.eclipse.core.internal.expressions.WithExpression.evaluate(WithExpression.java:81)
at org.eclipse.core.internal.expressions.ReferenceExpression.evaluate(ReferenceExpression.java:74)
at org.eclipse.core.internal.expressions.CompositeExpression.evaluateAnd(CompositeExpression.java:55)
at org.eclipse.core.internal.expressions.AndExpression.evaluate(AndExpression.java:34)
at org.eclipse.core.internal.expressions.ReferenceExpression.evaluate(ReferenceExpression.java:74)
at org.eclipse.ui.internal.services.EvaluationReference.evaluate(EvaluationReference.java:74)
at org.eclipse.ui.internal.services.EvaluationReference.evaluate(EvaluationReference.java:100)
at org.eclipse.ui.internal.services.EvaluationReference.changed(EvaluationReference.java:94)
at org.eclipse.e4.core.internal.contexts.TrackableComputationExt.update(TrackableComputationExt.java:108)
at org.eclipse.e4.core.internal.contexts.EclipseContext.processScheduled(EclipseContext.java:364)
at org.eclipse.e4.core.internal.contexts.EclipseContext.set(EclipseContext.java:379)
at org.eclipse.ui.internal.services.EvaluationService$1.changed(EvaluationService.java:79)
at org.eclipse.e4.core.internal.contexts.TrackableComputationExt.update(TrackableComputationExt.java:108)
at org.eclipse.e4.core.internal.contexts.EclipseContext.processScheduled(EclipseContext.java:364)
at org.eclipse.e4.core.internal.contexts.EclipseContext.set(EclipseContext.java:379)
at org.eclipse.ui.internal.WorkbenchPage.updateActiveEditorSources(WorkbenchPage.java:416)
at org.eclipse.ui.internal.WorkbenchPage.updateBroughtToTop(WorkbenchPage.java:465)
at org.eclipse.ui.internal.WorkbenchPage.access$4(WorkbenchPage.java:464)
at org.eclipse.ui.internal.WorkbenchPage$E4PartListener.partBroughtToTop(WorkbenchPage.java:222)
at org.eclipse.e4.ui.internal.workbench.PartServiceImpl$7.run(PartServiceImpl.java:317)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.firePartBroughtToTop(PartServiceImpl.java:314)
at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.access$4(PartServiceImpl.java:312)
at org.eclipse.e4.ui.internal.workbench.PartServiceImpl$1.handleEvent(PartServiceImpl.java:109)
at org.eclipse.e4.ui.services.internal.events.UIEventHandler.lambda$0(UIEventHandler.java:38)
at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:236)
at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:133)
at org.eclipse.swt.widgets.Display.syncExec(Display.java:4992)
at org.eclipse.e4.ui.internal.workbench.swt.E4Application$1.syncExec(E4Application.java:219)
at org.eclipse.e4.ui.services.internal.events.UIEventHandler.handleEvent(UIEventHandler.java:38)
at org.eclipse.equinox.internal.event.EventHandlerWrapper.handleEvent(EventHandlerWrapper.java:205)
at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:203)
at org.eclipse.equinox.internal.event.EventHandlerTracker.dispatchEvent(EventHandlerTracker.java:1)
at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:234)
at org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:151)
at org.eclipse.equinox.internal.event.EventAdminImpl.dispatchEvent(EventAdminImpl.java:132)
at org.eclipse.equinox.internal.event.EventAdminImpl.sendEvent(EventAdminImpl.java:75)
at org.eclipse.equinox.internal.event.EventComponent.sendEvent(EventComponent.java:44)
at org.eclipse.e4.ui.services.internal.events.EventBroker.send(EventBroker.java:55)
at org.eclipse.e4.ui.internal.workbench.UIEventPublisher.notifyChanged(UIEventPublisher.java:63)
at org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify(BasicNotifierImpl.java:424)
at org.eclipse.e4.ui.model.application.ui.impl.ElementContainerImpl.setSelectedElementGen(ElementContainerImpl.java:170)
at org.eclipse.e4.ui.model.application.ui.impl.ElementContainerImpl.setSelectedElement(ElementContainerImpl.java:188)
at org.eclipse.e4.ui.internal.workbench.ModelServiceImpl.showElementInWindow(ModelServiceImpl.java:658)
at org.eclipse.e4.ui.internal.workbench.ModelServiceImpl.bringToTop(ModelServiceImpl.java:622)
at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.delegateBringToTop(PartServiceImpl.java:790)
at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.bringToTop(PartServiceImpl.java:404)
at org.eclipse.e4.ui.internal.workbench.PartServiceImpl.showPart(PartServiceImpl.java:1266)
at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:3195)
at org.eclipse.ui.internal.WorkbenchPage.lambda$9(WorkbenchPage.java:3100)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:72)
at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:3098)
at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:3068)
at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:3051)
at ac.soton.eventb.emf.diagrams.navigator.action.OpenDiagramAction$OpenDiagramCommand.doExecute(OpenDiagramAction.java:168)
at org.eclipse.emf.workspace.AbstractEMFOperation.execute(AbstractEMFOperation.java:150)
at ac.soton.eventb.emf.diagrams.navigator.action.OpenDiagramAction.run(OpenDiagramAction.java:97)
at org.eclipse.ui.actions.RetargetAction.run(RetargetAction.java:215)
at org.eclipse.ui.navigator.CommonNavigatorManager$1.open(CommonNavigatorManager.java:183)
at org.eclipse.ui.OpenAndLinkWithEditorHelper$InternalListener.open(OpenAndLinkWithEditorHelper.java:48)
at org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:802)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:45)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:174)
at org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:799)
at org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1118)
at org.eclipse.ui.navigator.CommonViewer.handleOpen(CommonViewer.java:454)
at org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:275)
at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:270)
at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:310)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4385)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1512)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1535)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1520)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1324)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4172)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3789)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1158)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1047)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:155)
at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:658)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:338)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:557)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:154)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:150)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:137)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:107)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:401)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:657)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:594)
at org.eclipse.equinox.launcher.Main.run(Main.java:1447)
at org.eclipse.equinox.launcher.Main.main(Main.java:1420)

[cfsnook]

also same exception occurs in class diagrams..
could it be a problem in the Diagrams framework?