If you're seeing that on the actual page then something broke the JS binding preventing the JSON response from being caught and processed, which is usually caused by a fatal JS error on the page.
If you're seeing that in the developer tools of the browser then something broke the JSON response it self, which is usually caused by 3rd party Joomla content plugin injecting HTML or text into the buffer breaking the JSON output.
Kyle (Krileon)
Community Builder Team Member
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