Looks like you're hitting this one: https://bugzilla.redhat.com/show_bug.cgi?id=1701205
Although it a different scenario, the error that is the same UI error message.

Regards,
Shani Leviim


On Mon, Apr 22, 2019 at 6:24 AM <kiv@intercom.pro> wrote:
Of course:

2019-04-22 11:18:10,691+05 ERROR [org.ovirt.engine.ui.frontend.server.gwt.OvirtRemoteLoggingService] (default task-54) [] Permutation name: D61F00D17FE3467BBA8D0D9D801D9940
2019-04-22 11:18:10,691+05 ERROR [org.ovirt.engine.ui.frontend.server.gwt.OvirtRemoteLoggingService] (default task-54) [] Uncaught exception: com.google.gwt.event.shared.Umb
rellaException: Exception caught: undefined
        at java.lang.Throwable.Throwable(Throwable.java:70) [rt.jar:1.8.0_191]
        at java.lang.RuntimeException.RuntimeException(RuntimeException.java:32) [rt.jar:1.8.0_191]
        at com.google.web.bindery.event.shared.UmbrellaException.UmbrellaException(UmbrellaException.java:64) [gwt-servlet.jar:]
        at Unknown.new s1(webadmin-0.js)
        at com.google.gwt.event.shared.HandlerManager.$fireEvent(HandlerManager.java:117) [gwt-servlet.jar:]
        at com.google.gwt.user.client.ui.Widget.$fireEvent(Widget.java:127) [gwt-servlet.jar:]
        at com.google.gwt.user.client.ui.Widget.fireEvent(Widget.java:127) [gwt-servlet.jar:]
        at com.google.gwt.event.logical.shared.ValueChangeEvent.fire(ValueChangeEvent.java:40) [gwt-servlet.jar:]
        at org.ovirt.engine.ui.common.widget.editor.ListModelListBox.$lambda$2(ListModelListBox.java:251)
        at org.ovirt.engine.ui.common.widget.editor.ListModelListBox$lambda$2$Type.execute(ListModelListBox.java:251)
        at com.google.gwt.core.client.impl.SchedulerImpl.runScheduledTasks(SchedulerImpl.java:167) [gwt-servlet.jar:]
        at com.google.gwt.core.client.impl.SchedulerImpl.$flushPostEventPumpCommands(SchedulerImpl.java:338) [gwt-servlet.jar:]
        at com.google.gwt.core.client.impl.SchedulerImpl$Flusher.execute(SchedulerImpl.java:76) [gwt-servlet.jar:]
        at com.google.gwt.core.client.impl.SchedulerImpl.execute(SchedulerImpl.java:140) [gwt-servlet.jar:]
        at com.google.gwt.core.client.impl.Impl.apply(Impl.java:236) [gwt-servlet.jar:]
        at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:275) [gwt-servlet.jar:]
        at Unknown.eval(webadmin-0.js)
        at Unknown.d(webadmin-0.js)
Caused by: java.lang.NullPointerException
        at java.lang.Throwable.Throwable(Throwable.java:59) [rt.jar:1.8.0_191]
        at java.lang.Exception.Exception(Exception.java:25) [rt.jar:1.8.0_191]
        at java.lang.RuntimeException.RuntimeException(RuntimeException.java:25) [rt.jar:1.8.0_191]
        at Unknown.new TNf(webadmin-0.js)
        at javaemul.internal.InternalPreconditions.checkCriticalNotNull(InternalPreconditions.java:417) [gwt-servlet.jar:]
        at javaemul.internal.InternalPreconditions.checkNotNull(InternalPreconditions.java:403) [gwt-servlet.jar:]
        at org.ovirt.engine.ui.uicommonweb.models.vms.UnitVmModel.$compatibilityVersionChanged(UnitVmModel.java:2090)
        at org.ovirt.engine.ui.uicommonweb.models.vms.UnitVmModel.eventRaised(UnitVmModel.java:1962)
        at org.ovirt.engine.ui.uicompat.Event.$raise(Event.java:99)
        at org.ovirt.engine.ui.uicommonweb.models.ListModel.$setSelectedItem(ListModel.java:82)
        at org.ovirt.engine.ui.common.widget.uicommon.popup.AbstractVmPopupWidget_dataCenterWithClustersList_selectedItem_Context.$setInModel(AbstractVmPopupWidget_dataCente
rWithClustersList_selectedItem_Context.java:19)
        at org.ovirt.engine.ui.common.widget.uicommon.popup.AbstractVmPopupWidget_dataCenterWithClustersList_selectedItem_Context.setInModel(AbstractVmPopupWidget_dataCenter
WithClustersList_selectedItem_Context.java:19)
        at org.ovirt.engine.ui.common.editor.UiCommonEditorVisitor.$setInModel(UiCommonEditorVisitor.java:143)
        at org.ovirt.engine.ui.common.editor.UiCommonEditorVisitor.$lambda$0(UiCommonEditorVisitor.java:60)
        at org.ovirt.engine.ui.common.editor.UiCommonEditorVisitor$lambda$0$Type.onValueChange(UiCommonEditorVisitor.java:60)
        at com.google.gwt.event.logical.shared.ValueChangeEvent.dispatch(ValueChangeEvent.java:127) [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:]
        ... 14 more
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