sitemap run generator problem [help]

please help me
i got a problem when i tries to Run generator,this error shows picture attachment
please help me how to solve this.

[IMG]http://www.************/attachments/seo-search-engine-optimisation/32900d1307423306-sitemap-run-generator-problem-help-vbulletin-options-downloadzone2-movies-music-application-mobile-nokia-symbian-java-share-and-.png[/IMG]

The picture is not showing belows problems occured.

[SECTION START] showthread [8,098.7Kb mem used] [1,491,019s (+1,466,737s)]

Fatal error: Call to undefined method vB_Friendly_Url_Error::get_url() in /home/dz2/public_html/includes/functions.php on line 6876

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