Login Error Message

Just receiving this message when logging in… what do I do to fix it?

constant AIOSEO_VERSION - assumed 'AIOSEO_VERSION' (this will throw an Error in a future version of PHP) in /home/customer/www/glamkaren.com/public_html/wp-content/plugins/accelerated-mobile-pages/templates/features.php on line 3333

Warning: Cannot modify header information - headers already sent by (output started at /home/customer/www/glamkaren.com/public_html/wp-content/plugins/accelerated-mobile-pages/templates/features.php:3333) in /home/customer/www/glamkaren.com/public_html/wp-includes/functions.php on line 6362