error 1060 Duplicate column name

Hello
When adding a new field (it is not in the database) to the form created above
there is always an error 1060 Duplicate column name ...
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After clearing the cache -from the second time can add a field

Hi.
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I know this a old post, but it is the only about this subject.

What means "Don't use Auto Manage Table".

1 - I didn't find this option to disable it.
2 - How you load and save data? Custom blocks?

Auto Manage Table, a checkbox in the Save Data action, automatically adds or deletes columns to your selected data table when you save your form. It's fine when you're just dumping data in a table and don't care about data validation or format or anything..

And if you disable it, you use the "Data override" on the Save Data?

I disable "Auto manage the data table". Then insert my new field and save. Ok. Then enable "Auto manage the data table" and save. Ok.
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Let's see how long I go with this.