How to throw an error message if email is already in the GF Entries?

Hello,
How to throw an error message if email is already in the GF Entries?
I tried following this documentation but I can’t make it to work.
-DM

You may follow the solution from @david here: Duplicate entries - #3 by david

1 Like

2 guys from Facebook group provide me the solution. I just needed to select a field, under the General tab, tick the “No Duplicates” checkbox.

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