Gets through site.xml, post.xml, and post_google_news.xml but halts at page.xml with error:

Warning: simplexml_load_string(): Entity: line 119: parser error : Opening and ending tag mismatch: meta line 5 and head in /home/path/to/plugin/wp-content/plugins/warm-cache/warm_cache_crawl.php on line 163

Warning: simplexml_load_string(): </head> in /home/path/to/plugin/wp-content/plugins/warm-cache/warm_cache_crawl.php on line 163

Warning: simplexml_load_string(): ^ in /home/path/to/plugin/wp-content/plugins/warm-cache/warm_cache_crawl.php on line 163

(Using BWP Sitemap Generator.)
Thanks!
-Brian