Error message

• Notice: Undefined variable: nid in eval() (line 23 of /var/www/calas/sites/all/modules/views_php/plugins/views/views_php_handler_area.inc(40) : eval()'d code).
• Notice: Undefined variable: tid in eval() (line 23 of /var/www/calas/sites/all/modules/views_php/plugins/views/views_php_handler_area.inc(40) : eval()'d code).