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I’m trying to display comments from a activity feed post in a separate window. But I keep getting the message Error loading comments.

Part of the code for reference.

// AJAX handler for loading comments
function bpcp_load_comments() {
    $activity_id = intval($_POST['activity_id']);
    $sort_order = sanitize_text_field($_POST['sort_order']);

    if (!$activity_id) {
        wp_send_json_error('Invalid activity ID');
    }

    // Receiving comments
    $comments = bp_activity_get_meta($activity_id, 'comments');

    if (!$comments) {
        wp_send_json_error('Error loading comments');
    }

    if ($sort_order === 'popular') {
        usort($comments, function($a, $b) {
            $a_votes = get_comment_meta($a['id'], 'votes', true);
            $b_votes = get_comment_meta($b['id'], 'votes', true);
            return $b_votes - $a_votes;
        });
    } else {
        usort($comments, function($a, $b) {
            return strtotime($b['date_recorded']) - strtotime($a['date_recorded']);
        });
    }

    wp_send_json_success($comments);
}
add_action('wp_ajax_bpcp_load_comments', 'bpcp_load_comments');
add_action('wp_ajax_nopriv_bpcp_load_comments', 'bpcp_load_comments');