Paid Memberships Pro crash my site

Hello

I got some issues about one of these plugins: Paid memberships pro or the WooCommerce Add On , after adding a new memebership, it crashes down the site, now i cant activate it again without getting strange errors or crashes.

when activate the plugins;

Getting an error of ERR_TOO_MANY_REDIRECTS

and:

Notice: screen_icon har været forældet siden version 3.8.0, og der er ingen alternativer. in /customers/b/2/d/stophetzen.nu/httpd.www/wp-includes/functions.php on line 3842 Notice: get_screen_icon har været forældet siden version 3.8.0, og der er ingen alternativer. in /customers/b/2/d/stophetzen.nu/httpd.www/wp-includes/functions.php on line 3842

– please help 🙁

Website: stophetzen.nu
Extra details: /wp-login.php User: Admin Pass: solanes12345

…And ftp info

Host: http://ftp.stophetzen.nu

Username: stophetzen.nu

Port: 21

Password: Solanes12345