can't activate the plugin in Wordpress

[christianfroehlichconsulting]

Warning: require_once(/srv/www/adressbuch.test/public_html/wp-content/plugins/google-contacts-for-wordpress-plugin-master/vendor/autoload.php): failed to open stream: No such file or directory in /srv/www/adressbuch.test/public_html/wp-content/plugins/google-contacts-for-wordpress-plugin-master/google-contacts-for-wordpress.php on line 12

Fatal error: require_once(): Failed opening required '/srv/www/adressbuch.test/public_html/wp-content/plugins/google-contacts-for-wordpress-plugin-master/vendor/autoload.php' (include_path='.:/usr/share/php') in /srv/www/adressbuch.test/public_html/wp-content/plugins/google-contacts-for-wordpress-plugin-master/google-contacts-for-wordpress.php on line 12

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