I have written an application in access that uses a tree view control. The application works well on my machine and many others. I am running Windows XP and Access 2002. The issue I have is that when I send it to a colleague who also has Windows XP and Access 2002 he gets the following error: 35603, invalid key, the key I am adding is all charactors and numbers. Does anyone have any idea on how to fix this?