"A minor can’t be a parent or guardian."
Where: Add a parent or guardian > A student at the school.
Why: the chosen student is a minor, and a minor cannot be a parent or guardian.
What to do: choose an adult student, or add the person with A person.
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Write to bonjour@martialnote.com from your account's address, saying which screen is involved and the message shown. Support is by email only, with no guaranteed response time. Never send information about your students.