The error means you've tried to save a record with a key which already exists in the table. See the comment I added following your post to http://www.tersus.com/#Id=5094 (at the very end).
Based on your a.JPG , I deduce that the table in question is ItemRecord and your key is Picture (since that is the first field in the table, and by default the primary key).
Since we're using the sample image in this demo, rather than taking actual pictures using the camera, the Picture field will always contain the same value (=same picture), and therefore will issue the error starting with the second time you try to save it.
To overcome this you should change your model, so that the primary key is unique. In a real application, there would usually another field, serving as the primary key (an Id field which is usually a numeric sequence, timestamp or similar).
For best results, use the Firefox browser..