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My main complaint with that roadmap is that it changes often. Your data today may not be accurate in a couple of weeks

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oh nevermind, I misunderstood your question

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You could check the composer.json file of each tagged release?

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If you inspect the code on the frontend so you can see the actual HTML. What does the "name" attribute say?

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If you're using Member Profiles, make sure the Email address field is present on the form

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Your error is caused on Line 80 in MemberProfileValidator. To troubleshoot the issue, you're dumping out the $data array to see the field names that are available

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What happens if you put a var_dump($data);die; right before that line?

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It's basically complaining that $data['Email'] doesn't exist