@Pedro_Paulo_Sant_Ann
Hi Pedro,
Every table is supposed to have a schema that lists the fields in the table. The error indicates that several of your tables no longer have a schema associated with them. I am not sure what caused this problem. We can investigate that later.
For now, you need go to your version history and restore an earlier version of your app. You can do that by going to the Manage > Version pane and clicking Version History.
Phil
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