Im using version 1.3.9
installed mistik template.
when I try and log in I get this error:

Fatal error: Call to undefined function zen_check_url_get_terms() in /hermes/bosweb/web092/b929/ipg.desertmoonleathercom/zen/admin/index.php on line 30

the site is working fine.
I have not touched ther file mentioned in the error message.