Activation fatal error

I tried to activate the plugin Author Box and I received this message
I tried to turn of most of plugins all time the same

Fatal error: Can’t use function return value in write context in /home/www/www.meet.sk/ertlphoto/wp-content/plugins/amp-author-box/amp-author-box.php on line 571

The page I need help with: [log in to see the link]