Fatal error: Uncaught Error: Call to undefined method Composer\Autoload\ClassLoader::setClassMapAuthoritative() in /home/liefde1q/public_html/wp-content/plugins/mailchimp-for-wp/vendor/composer/autoload_real.php:34 Stack trace: #0 /home/liefde1q/public_html/wp-content/plugins/mailchimp-for-wp/vendor/autoload.php(25): ComposerAutoloaderInit80d6ab236fb6085dfdecfd8ffd94dcde::getLoader() #1 /home/liefde1q/public_html/wp-content/plugins/mailchimp-for-wp/mailchimp-for-wp.php(54): require_once('/home/liefde1q/...') #2 /home/liefde1q/public_html/wp-includes/class-wp-hook.php(324): _mc4wp_load_plugin('') #3 /home/liefde1q/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #4 /home/liefde1q/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #5 /home/liefde1q/public_html/wp-settings.php(506): do_action('plugins_loaded') #6 /home/liefde1q/public_html/wp-config.php(70): require_once('/home/liefde1q/...') #7 /home/liefde1q/public_html/wp-load.php(50): require_once('/home/liefde1q/...') # in /home/liefde1q/public_html/wp-content/plugins/mailchimp-for-wp/vendor/composer/autoload_real.php on line 34