I get some warnings too:
Warning: is_file(): open_basedir restriction in effect. File(/usr/home/mydomain.com/web/wp-content/plugins/newsletter/emails/themes/composer.gif/theme.php) is not within the allowed path(s): (/usr/home/mydomain.com/:/home/mydomain.com/:/usr/home/services/:/usr/share/php70/) in /usr/home/mydomain.com/web/wp-content/plugins/newsletter/includes/themes.php on line 114
Is it normal?