Information in this article applies to:
Article ID: NGN1211 — Created: 1 Jun 2018 — Reviewed: 9 Nov 2022
After many days or weeks of successfully using a uScope Whole Slide Scanner with the uScope Navigator Software, launching the uScope Navigator Application displays a dialog indicating that an Unhandled Exception has occurred.
Restarting the software displays the same Exception dialog. Cycling power and unplugging/reconnecting the USB cable to the uScope also have no effect.
Clicking the Details button on the Exception dialog displays the following:
************** Exception Text ************** System.NullReferenceException: Object reference not set to an instance of an object. at uScopeNav.frmNewApp.frmNewApp_Load(Object sender, EventArgs e) at System.Windows.Forms.Form.OnLoad(EventArgs e) at DevComponents.DotNetBar.RibbonForm.OnLoad(EventArgs e) at System.Windows.Forms.Form.OnCreateControl() at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible) at System.Windows.Forms.Control.CreateControl() at System.Windows.Forms.Control.WmShowWindow(Message& m) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.Form.WmShowWindow(Message& m) at DevComponents.DotNetBar.RibbonForm.WndProc(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
This problem is caused when either the device settings or application settings files are corrupted.
This exception is likely caused by a missing or corrupt configuration file.
Application settings files are stored in the following folder:
In that folder, you should see a file named Current.xml. Check to make sure that file exists and that is it not empty.
If the file is missing or empty, please contact Technical Support to request a copy of the application settings file.
This problem has occurred very few times and is not likely to occur. It can be caused by the following: