Notice: SmartyValidate: [is_valid] form 'submit_link' is not registered. in /home/xxx/public_html/libs/smarty/SmartyValidate.class.php on line 273
Notice: SmartyValidate: [validate plugin] form 'submit_link' is not registered. in /home/xxx/public_html/libs/smarty/plugins/function.validate.php on line 46
You might get similar errors. I received them on admin login form and cleaning template files from /temp/templates directory, reopening site or restarting internet browser helped out to solve PHPLinkDirectory Smarty issue.