Thanks David ..I am still coming to grips with how to convert my non-visual design and programming experience to implement functionality i.e. doing things the Tersus way.
I have back-tracked and created a simple one-field table (native mobile) app based on the guestbook tutorial which works fine. As a stage two I went back into the data structure and added a second new field but didn't want to display it on the existing screen or add a value into it with any existing popup just yet. That broke it with "no such table:undefined " error .. I removed the new field and it all worked so I am assuming there are rules about unreferenced fields. Haven't seen documentation to deal with this sort of issue .. is there any?
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