Error attempting to add a custom emulator

[PhuriousGeorge]

Object reference not set to an instance of an object.

App: LaunchBox Version: 8.3-beta-2 Type: System.NullReferenceException Site: Void (Unbroken.LaunchBox.Desktop.Forms.EmulatorForm) Source: LaunchBox

at (EmulatorForm ) at Unbroken.LaunchBox.Desktop.Forms.EmulatorForm.AddCoresFromApplicationStartupPath() at (EmulatorForm , Object , EventArgs ) at Unbroken.LaunchBox.Desktop.Forms.EmulatorForm.field_Changed(Object sender, EventArgs e) at System.Windows.Forms.CheckBox.OnCheckedChanged(EventArgs e) at System.Windows.Forms.CheckBox.set_CheckState(CheckState value) at System.Windows.Forms.CheckBox.OnClick(EventArgs e) at System.Windows.Forms.CheckBox.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.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

Recent Log:

8:39:17 PM Music.Pause Start 8:39:17 PM Music.Prepare Start 8:39:17 PM Music.Kill Start 8:39:17 PM Music.Kill Finished 8:39:17 PM Music.NotifyTrackList Start 8:39:17 PM Music.NotifyTrackList Invoke 8:40:23 PM Exception