exception thrown on CRC card

Hello,

I was cheerfully adding 'responsibilities' to a CRC card, when I got an exception:

System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.

Parameter name: index

at System.Collections.Generic.List`1.get_Item(Int32 index)

at SoftwareIdeasModeler.Controls.FastGrid.FastGrid.DrawGrid(PaintEventArgs e)

at System.Windows.Forms.Control.PaintWithErrorHandling(PaintEventArgs e, Int16 layer)

at System.Windows.Forms.Control.WmPaint(Message& m)

at System.Windows.Forms.Control.WndProc(Message& m)

at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

When I got this exception, I had added 18 items to the responsibility list. I tried removing items, but I still got this exception. I also restarted the application, but I continue to get this exception.

What is the upper limit for items in the responsibility and collaborators list?

Best Regards,

Mike