Wordpress - RevolutionSlider Plugin error "Settings (slider_settings) Error: Wrong xml file format"

I have a problem with a theme purchased from envato, which has the entire plugin "Revolution Slider". I can install and activate the plugin correctly, but when I enter the configuration page "http://localhost:8080/wp-admin/admin.php? Page = revslider". I use php dev server for google app engine.

I get the following error:

Settings (slider_settings) Error: Wrong xml file format:/base/data/home/apps/s~smartly-website-001/versionsmartlywebsite001.381935918886632380/wordpress/wp-content/plugins/revslider/settings//slider_settings.xml

0/base/data/home/apps/s~smartly-website-001/versionsmartlywebsite001.381935918886632380/wordpress/wp-content/plugins/revslider/inc_php/framework/settings.class.php(682): UniteFunctionsRev :: throwError ('Wrong xml file ...') 1/base/data/home/apps/s~smartly-website-001/versionsmartlywebsite001.381935918886632380/wordpress/wp-content/plugins/revslider/settings/slider_settings.php(123): UniteSettingsRev-> loadXMLFile ('/ base / data / home ...') 2/base/data/home/apps/s~smartly-website-001/versionsmartlywebsite001.381935918886632380/wordpress/wp-content/plugins/revslider/inc_php/framework/base_admin.class.php(344): require ('/ base / data / home ...') 3/base/data/home/apps/s~smartly-website-001/versionsmartlywebsite001.381935918886632380/wordpress/wp-content/plugins/revslider/revslider_admin.php(279): UniteBaseAdminClassRev :: requireSettings ('slider_settings') 4 [internal function]: RevSliderAdmin-> adminPages ('') 5/base/data/home/apps/s~smartly-website-001/versionsmartlywebsite001.381935918886632380/wordpress/wp-includes/plugin.php(496): call_user_func_array (Array, Array) 6/base/data/home/apps/s~smartly-website-001/versionsmartlywebsite001.381935918886632380/wordpress/wp-admin/admin.php(212): do_action ('toplevel_page_r ...') 7 {main}

Thank you very much