Error message

• Notice: Undefined index: und in include() (line 101 of sites/all/themes/enviro11/templates/node--installations.tpl.php).
• Notice: Trying to access array offset on value of type null in include() (line 101 of sites/all/themes/enviro11/templates/node--installations.tpl.php).
• Notice: Trying to access array offset on value of type null in include() (line 101 of sites/all/themes/enviro11/templates/node--installations.tpl.php).