Can’t activate theme – Fatal error: Uncaught Error: Call to undefined

Fatal error: Uncaught Error: Call to undefined function mysql_get_server_info() in /home/***/domains/***.com/public_html/wp-content/plugins/newsplugin/news-plugin-utils.php:263 Stack trace: #0 /home/***/domains/***.com/public_html/wp-content/plugins/newsplugin/news-plugin.php(55): News_Plugin_Utils::get_system_info() #1 /home/***/domains/***.com/public_html/wp-content/plugins/newsplugin/news-plugin.php(938): News_Plugin->__construct() #2 /home/***/domains/***.com/public_html/wp-admin/includes/plugin.php(1943): include(‘/home/***/…’) #3 /home/***/domains/***.com/public_html/wp-admin/plugins.php(164): plugin_sandbox_scrape(‘newsplugin/news…’) #4 {main} thrown in /home/***/domains/***.com/public_html/wp-content/plugins/newsplugin/news-plugin-utils.php on line 263