Drupal error

My CMS drupal website was working fine. suddenly I start getting the below error:

Fatal error: Call to undefined function phptemplate_body_class() in /var/www/vhosts/blominvestksa.com/httpdocs/sites/all/themes/danland/page-front.tpl.php on line 65

Please assist
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Have you just updated Drupal?
Try reinstalling the theme
ramziabkAuthor Commented:
Thanks for your reply.
No I didn't update drupal.How to reinstall the theme?
Just upload a clean version (assuming you haven't made any changes to it)

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ramziabkAuthor Commented:
did that. Installed Danland theme again but still same error.
Remove the theme, clear you cache, check if site is working
Upload theme again and clear cache

If still not working you may need to contact the theme author
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