I'm testing the Acymailing wordpress version. There is no other plugin installed and i work on the default wordpress theme. I turned on the wordpress debug, here are the errors:

Warning: simplexml_load_file(): http:// wrapper is disabled in the server configuration by allow_url_fopen=0 in /usr/www/users/mailev/wp/wp-content/plugins/acymailing/back/helpers/helper.php on line 3002

Warning: simplexml_load_file(http://mailer.iapopsi.gr/wp/wp-content/plugins/acymailing/media/images/loader.svg): failed to open stream: no suitable wrapper could be found in /usr/www/users/mailev/wp/wp-content/plugins/acymailing/back/helpers/helper.php on line 3002

Warning: simplexml_load_file(): I/O warning : failed to load external entity "http://mailer.iapopsi.gr/wp/wp-content/plugins/acymailing/media/images/loader.svg" in /usr/www/users/mailev/wp/wp-content/plugins/acymailing/back/helpers/helper.php on line 3002

Fatal error: Access level to plgAcymArticle::replaceOne() must be protected (as in class acymPlugin) or weaker in /usr/www/users/mailev/wp/wp-content/plugins/acymailing/back/dynamics/article/plugin.php on line 329