I got error when adding any performance visualizer in my WLD, the error is shown below:

************** Exception Text **************
System.ArgumentOutOfRangeException: InvalidArgument=Value of '-1' is not valid for 'index'.
Parameter name: index
at System.Windows.Forms.ComboBox.ObjectCollection.get_Item(Int32 index)
at WealthLabPro.PreferencesForm.d()
at WealthLabPro.PreferencesForm.aj(Object A_0, EventArgs A_1)
at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

Sorry for the inconvenience. This issue is known, please see below for a workaround:

Error when changing Preferences (6.8)

P.S. Correction: error when enabling any visualizer, not "adding". Misleading topic title edited.