Error message

• Notice: Undefined index: lng in require() (line 23 of /var/www/vhosts/rovi.es/httpdocs/sites/all/themes/gavias_mely/gavias_mely_sub/template/page/header.tpl.php).
• Notice: Undefined index: lng in require() (line 24 of /var/www/vhosts/rovi.es/httpdocs/sites/all/themes/gavias_mely/gavias_mely_sub/template/page/header.tpl.php).
• Notice: Undefined variable: base_url in include() (line 505 of /var/www/vhosts/rovi.es/httpdocs/sites/all/themes/gavias_mely/gavias_mely_sub/template/html.tpl.php).
• Notice: Undefined index: content in _drupal_default_html_head() (line 345 of /var/www/vhosts/rovi.es/httpdocs/includes/common.inc).