I updated site of my customer to joomla 3.9.2 and PHP 7.1. Now I have an error


Warning: A non-numeric value encountered in /....../public_html/templates/as002040free/includes/includes.php on line 79

I tried to update this tempalte but I recive an error:

×
Warning
Extension Install: Another template is already using the named folder: /*******/templates/as002040free. Are you trying to install the same extension again?
×
Error
Error installing template

I think that after first message there should be message box and after saying yes template should upate but I , am receiveng error installing template