Hi,
This error is caused by either a missing "recipients" field in your form or if it has a value that doesn't match your $TARGET_EMAIL setting in FormMail.
You can review the documentation above $TARGET_EMAIL to resolve the problem and use the various samples we give for that setting.
If you still can't figure it out, please post or Private Message your setting and I'll be able to assist you.
BTW, the form URL you gave issues a 404 error.
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