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I get the following error if a users email is already in the table.How do I validate if it exists before submission so the messages don't conflict for the user?
A user already exists for the user name specified. Please register again using a different user name.
The error is the validation; requesting the user to change the username and try again. If you need to validate prior to the user clicking on submit button then you'll need to write your own sql for validation and run it via JavaScript action. There is no documentation for this as the setup varies for each use case.