drush generate sitemap errors
# drush xmlsitemap-regenerate
PHP Fatal error: Class 'XMLWriter' not found in /home/public_html/sites/all/modules/xmlsitemap/xmlsitemap.xmlsitemap.inc on line 15
Drush command terminated abnormally due to an unrecoverable error. [error]
Error: Class 'XMLWriter' not found in
/home/public_html/sites/all/modules/xmlsitemap/xmlsitemap.xmlsitemap.inc,
line 15
PHP 5.3.28 (cli) (built: Jun 1 2014 10:31:43)
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2013 Zend Technologies
Please help me solve this problem.