Hello, I am experiencing a persistent issue with the Form Builder addon in SP Page Builder 5.3. Every time I try to submit the form, it returns the error: "Отправка письма не удалась, заполните обязательное поле..." (Submit Failed). What I have already checked/done: Email Settings: Global Configuration in Joomla is working correctly (test emails are sent successfully). Recipient Email: Correctly filled in the addon settings. From Email: Tested with both a valid email and an empty field. Form Fields: I reduced the form to a single "Name" field (non-required), but the error persists. Subject: Changed from dynamic tags to plain text. Captcha: Disabled. Conflict Test: Other forms on the site (like simple newsletter fields) work fine, but Form Builder does not. It seems like the AJAX request is failing or the PHP controller of the addon is not processing the data correctly. Please help me resolve this conflict. I can provide admin access if needed. PHP 8.1.34, template: revstat