Revolution Slider : Settings (slider_settings) Error: Wrong xml file format

Hello everyone,
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 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}

I use php dev server google app engine.

Thank you very much