error simplexml_load_string

Hi .
I installed your plugin but it not work and give me 3 messages :
– Warning: simplexml_load_string() [function.simplexml-load-string]: Entity: line 1: parser error : Start tag expected, ‘<‘ not found in /mysite/wp-content/plugins/list-rank-dashboard-widget/wp-list-rank-class.php on line 667

– Warning: simplexml_load_string() [function.simplexml-load-string]: Destination host forbidden in /mysite/wordpress/wp-content/plugins/list-rank-dashboard-widget/wp-list-rank-class.php on line 667

– Warning: simplexml_load_string() [function.simplexml-load-string]: ^ in /mysite/wp-content/plugins/list-rank-dashboard-widget/wp-list-rank-class.php on line 667

Thanks .

https://www.ads-software.com/extend/plugins/list-rank-dashboard-widget/