Open Dental Forum

What is this error and how can this be fixed?

Unhandled exception: Could not load type 'OpenDental.UI.ODGridRowCollection' from assembly 'OpenDentBusiness, Version=19.4.36.0, Culture=neutral, PublicKeyToken=null'.
System.TypeLoadException
at ‌‏‎‍‭‭‍‍‌‎‬‪‭‌‍‎‮‎‎‍‮.‏‫‫‫‍‍‬‏‏‭‎‫‎‫‌‪‬‪‪‭‮‫‫‬‍‪‫‮‮(Object , ODGridClickEventArgs )
at OpenDental.UI.ODGridClickEventHandler.Invoke(Object sender, ODGridClickEventArgs e)
at OpenDental.UI.ODGrid.OnCellClick(Int32 col, Int32 row, MouseButtons button) in C:\Development\OPEN DENTAL SUBVERSION\opendental19.4\OpenDentBusiness\UI\ODGrid.cs:line 257
at OpenDental.UI.ODGrid.OnClick(EventArgs e) in C:\Development\OPEN DENTAL SUBVERSION\opendental19.4\OpenDentBusiness\UI\ODGrid.cs:line 1013
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
at System.Windows.Forms.ContainerControl.WndProc(Message& m)
at System.Windows.Forms.UserControl.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

Are you building Open Dental from source code? If so, it looks like some files are outdated. I would try updating through SVN, then clean and build the solution.

If this error is happening with a standard installation of Open Dental, I will need some more information in order to investigate the issue further. It looks like this error happens when a cell in a grid is clicked. Which window is this happening on?

window 10 and yes when I click on the table it gives me the error and I then have to close opendental on the work station. I did run the check, fix and optimization tool on open-dental on the server. Any reason why it still occurs?

What is the name of the grid and the window that the grid is on that is causing this error?

the grid with name and address- if I double click- error happen

The error indicates that you are using Open Dental version 19.4. I would update to the most recent stable version. If that does not resolve the issue, please contact support, https://www.opendental.com/contact.html.