Error: Object reference not set to an instance of an object when accessing Recording Server from Management Client.

All of a sudden I started getting this exception when trying to access the Recording Servers from the Management Client. Xprotect Essential +. I attempted to reinstall and the error persists:

************** Exception Text **************

Exception source: VideoOS.Administration.AddIn

Exception type: System.NullReferenceException

Exception message: Object reference not set to an instance of an object.

Exception target site: Activate

at VideoOS.Administration.AddIn.UserControlDeviceInfo.Activate()

at VideoOS.Administration.AddIn.UserControlRecorder.treeRecorder_AfterSelect(Object sender, SelectEventArgs e)

at Infragistics.Win.UltraWinTree.UltraTree.OnAfterSelect(SelectEventArgs e)

at Infragistics.Win.UltraWinTree.UltraTree.FireEvent(TreeEventIds id, EventArgs e)

at Infragistics.Win.UltraWinTree.UltraTree.SelectNewSelection(SelectedNodesCollection selected, Boolean isRangeSelect, Boolean invalidate)

at Infragistics.Win.UltraWinTree.UltraTree.InternalSelectItem(ISelectableItem item, Boolean clearExistingSelection, Boolean select)

at Infragistics.Win.UltraWinTree.UltraTreeNode.set_Selected(Boolean value)

at VideoOS.Administration.Controls.TreeBase.SelectNode(String key)

at VideoOS.Administration.Controls.RecorderTree.Load(ConfigurationManager configurationManager, LoadHierarchy loadHierarchy, String[] deviceTypes, DeviceFilters deviceFilter, Boolean allowLabelEdit, Boolean doubleClickExpands)

at VideoOS.Administration.AddIn.UserControlRecorder.RefreshPlugin(Boolean forceUpdate, Guid selectRecorderId)

at VideoOS.Administration.AddIn.UserControlRecorder.Activate(NavigationItem item)

at VideoOS.Administration.FormMain.ShowAdminUserControlEventHandler(Object sender, NavigationTreeShowControlEventArgs e)

at VideoOS.Administration.NavigationTree._AfterSelect(Object sender, SelectEventArgs e)

at Infragistics.Win.UltraWinTree.UltraTree.OnAfterSelect(SelectEventArgs e)

at Infragistics.Win.UltraWinTree.UltraTree.FireEvent(TreeEventIds id, EventArgs e)

at Infragistics.Win.UltraWinTree.UltraTree.SelectNewSelection(SelectedNodesCollection selected, Boolean isRangeSelect, Boolean invalidate)

at Infragistics.Win.UltraWinTree.UltraTree.Infragistics.Win.ISelectionManager.SelectItem(ISelectableItem item, Boolean clearExistingSelection)

at Infragistics.Win.SelectionStrategySingle.OnMouseDown(ISelectableItem item, MouseMessageInfo& msginfo, Boolean forceDrag)

at Infragistics.Win.ControlUIElementBase.ProcessMouseDownHelper(Object sender, MouseEventArgs e)

at Infragistics.Win.ControlUIElementBase.ProcessMouseDown(Object sender, MouseEventArgs e)

at Infragistics.Win.Utilities.ProcessEvent(Control control, ProcessEvent eventToProcess, EventArgs e)

at Infragistics.Win.UltraWinTree.UltraTree.OnMouseDown(MouseEventArgs e)

at System.Windows.Forms.Control.WmMouseDown(Message& m, MouseButtons button, Int32 clicks)

at System.Windows.Forms.Control.WndProc(Message& m)

at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

************** System Info **************

If I understand the situation correctly you are experiencing errors and you have not developed an integration using the MIP SDK that cause this error.

If my understanding is correct this is a question suited for the Milestone Support Community.

https://supportcommunity.milestonesys.com