trying to install Appointments on clients site, latest

Hi,

trying to install Appointments on clients site, latest WordPress 3.7, every time I activate I get the white screen of death and have to FTP to delete the plugin to restore the website.

This may be a clue, when I instal the plugin, I get this warning?

Warning: Missing argument 3 for wpseo_upgrader_process_complete() in /home/barcupol/public_html/wp-content/plugins/wordpress-seo/inc/wpseo-non-ajax-functions.php on line 259