Email Parser

I find I am able to add exactly 4 fields to an action, and it doesn't matter what they are. If I add a fifth field the app throws the following exception when I try to save. Has anyone seen this? Everything works fine with four fields writing to excel.

************** Exception Text **************
System.ArgumentException: IComparer (or the IComparable methods it relies upon) did not return zero when Array.Sort called x. CompareTo(x). x: '' x's type: 'DataGridViewColumn' The IComparer: 'System.Array+FunctorComparer`1[System.Windows.Forms.DataGridViewColumn]'.
at System.Collections.Generic.ArraySortHelper`1.Sort(T[] keys, Int32 index, Int32 length, IComparer`1 comparer)
at System.Array.Sort[T](T[] array, Int32 index, Int32 length, IComparer`1 comparer)
at System.Collections.Generic.List`1.Sort(Comparison`1 comparison)
at A.P.N()
at A.G.MB()
at A.G.LB(Object A, EventArgs B)
at System.Windows.Forms.Control.OnClick(EventArgs e)
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.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)