/**
     * Retry Request with Exponential Backoff
     *
     * @param callable $callback
     * @param int $attempts
     * @return array
     */
    private function retry(
        callable $callback,
        int $attempts = 3
    ): array {

        $baseDelay = (int) (
            $this->settings['retry_delay']
            ?? 2
        );

        $lastResult = [
            'success' => false,
            'message' => __('Retry limit reached.', 'ann-ai'),
        ];

        for (
            $i = 1;
            $i <= $attempts;
            $i++
        ) {

            $result = $callback();
            $lastResult = $result;

            if (
                !empty($result['success'])
            ) {

                return $result;

            }

            if ($i < $attempts) {
                $delay = $baseDelay * (1 << ($i - 1));
                sleep($delay);
            }

        }

        // FIX 2 Applied: Update statistics when retry limit is reached
        $this->updateStatistics(false);

        return $lastResult;
    }<br />
<b>Fatal error</b>:  Uncaught Error: Class &quot;ANN\AI_Engine&quot; not found in /srv/htdocs/wp-content/plugins/ann-ai-auto-publisher-pro/includes/class-loader.php:197
Stack trace:
#0 [internal function]: ANN\Loader::{closure:ANN\Loader::init():195}(Object(ANN\Container))
#1 /srv/htdocs/wp-content/plugins/ann-ai-auto-publisher-pro/includes/class-container.php(133): call_user_func(Object(Closure), Object(ANN\Container))
#2 /srv/htdocs/wp-content/plugins/ann-ai-auto-publisher-pro/includes/class-loader.php(248): ANN\Container-&gt;get('ai')
#3 [internal function]: ANN\Loader::{closure:ANN\Loader::init():243}(Object(ANN\Container))
#4 /srv/htdocs/wp-content/plugins/ann-ai-auto-publisher-pro/includes/class-container.php(133): call_user_func(Object(Closure), Object(ANN\Container))
#5 /srv/htdocs/wp-content/plugins/ann-ai-auto-publisher-pro/includes/class-loader.php(288): ANN\Container-&gt;get('ajax')
#6 /wordpress/core/7.0.2/wp-includes/class-wp-hook.php(341): ANN\Loader::init('')
#7 /wordpress/core/7.0.2/wp-includes/class-wp-hook.php(365): WP_Hook-&gt;apply_filters(NULL, Array)
#8 /wordpress/core/7.0.2/wp-includes/plugin.php(522): WP_Hook-&gt;do_action(Array)
#9 /wordpress/core/7.0.2/wp-settings.php(622): do_action('plugins_loaded')
#10 /srv/htdocs/wp-config.php(87): require_once('/wordpress/core...')
#11 /wordpress/core/7.0.2/wp-load.php(55): require_once('/srv/htdocs/wp-...')
#12 /wordpress/core/7.0.2/wp-blog-header.php(13): require_once('/wordpress/core...')
#13 /wordpress/core/7.0.2/index.php(17): require('/wordpress/core...')
#14 {main}
  thrown in <b>/srv/htdocs/wp-content/plugins/ann-ai-auto-publisher-pro/includes/class-loader.php</b> on line <b>197</b><br />