I want to delete some old snapshots, but when I try to access the list of snapshots in using the engine UI I get "Uncaught exception occurred...Details: Exception Caught: html is null..." The logs show the following 2018-09-29 18:42:50,953-04 ERROR [org.ovirt.engine.ui.frontend.server.gwt.OvirtRemoteLoggingService] (default task-41) [] Permutation name: 53B2DF1D843A2038913DD336F86985B4 2018-09-29 18:42:50,953-04 ERROR [org.ovirt.engine.ui.frontend.server.gwt.OvirtRemoteLoggingService] (default task-41) [] Uncaught exception: com.google.gwt.event.shared.UmbrellaException: Exception caught: html is null at java.lang.Throwable.Throwable(Throwable.java:70) [rt.jar:1.8.0_161] at java.lang.RuntimeException.RuntimeException(RuntimeException.java:32) [rt.jar:1.8.0_161] at com.google.web.bindery.event.shared.UmbrellaException.UmbrellaException(UmbrellaException.java:64) [gwt-servlet.jar:] at Unknown.new C0(webadmin-0.js) at com.google.gwt.event.shared.HandlerManager.$fireEvent(HandlerManager.java:117) [gwt-servlet.jar:] at com.google.gwt.view.client.SelectionChangeEvent.fire(SelectionChangeEvent.java:67) [gwt-servlet.jar:] at com.google.gwt.view.client.SingleSelectionModel.$resolveChanges(SingleSelectionModel.java:118) [gwt-servlet.jar:] at com.google.gwt.view.client.SingleSelectionModel.fireSelectionChangeEvent(SingleSelectionModel.java:107) [gwt-servlet.jar:] at com.google.gwt.view.client.SelectionModel$AbstractSelectionModel$1.execute(SelectionModel.java:128) [gwt-servlet.jar:] at com.google.gwt.core.client.impl.SchedulerImpl.runScheduledTasks(SchedulerImpl.java:167) [gwt-servlet.jar:] at com.google.gwt.core.client.impl.SchedulerImpl.$flushFinallyCommands(SchedulerImpl.java:272) [gwt-servlet.jar:] at com.google.gwt.core.client.impl.Impl.exit(Impl.java:313) [gwt-servlet.jar:] at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:275) [gwt-servlet.jar:] at Unknown.eval(webadmin-0.js) Caused by: java.lang.NullPointerException: html is null at java.lang.Throwable.Throwable(Throwable.java:64) [rt.jar:1.8.0_161] at java.lang.Exception.Exception(Exception.java:28) [rt.jar:1.8.0_161] at java.lang.RuntimeException.RuntimeException(RuntimeException.java:28) [rt.jar:1.8.0_161] at Unknown.new lIf(webadmin-0.js) at Unknown.new uKe(webadmin-0.js) at org.ovirt.engine.ui.common.widget.uicommon.vm.VmSnapshotListViewItem.$createNicsItemContainerPanel(VmSnapshotListViewItem.java:91) at org.ovirt.engine.ui.common.widget.uicommon.vm.VmSnapshotListViewItem.$updateValues(VmSnapshotListViewItem.java:397) at Unknown.new _Ip(webadmin-143.js) at org.ovirt.engine.ui.webadmin.section.main.view.tab.virtualMachine.SubTabVirtualMachineSnapshotView.$createListViewItem(SubTabVirtualMachineSnapshotView.java:68) at org.ovirt.engine.ui.webadmin.section.main.view.tab.virtualMachine.SubTabVirtualMachineSnapshotView.createListViewItem(SubTabVirtualMachineSnapshotView.java:68) at org.ovirt.engine.ui.common.widget.listgroup.PatternflyListView.$updateInfoPanel(PatternflyListView.java:137) at org.ovirt.engine.ui.common.widget.listgroup.PatternflyListView.$processSelectionChanged(PatternflyListView.java:126) at org.ovirt.engine.ui.common.widget.listgroup.PatternflyListView$lambda$0$Type.onSelectionChange(PatternflyListView.java:59) at com.google.gwt.view.client.SelectionChangeEvent.dispatch(SelectionChangeEvent.java:98) [gwt-servlet.jar:] at com.google.gwt.event.shared.GwtEvent.dispatch(GwtEvent.java:76) [gwt-servlet.jar:] at com.google.web.bindery.event.shared.SimpleEventBus.$doFire(SimpleEventBus.java:173) [gwt-servlet.jar:] Any ideas? Can I delete the snapshots using virsh as a backup?