Upgrade a prestashop webshop

I am having problems in upgrading my prestashop webshop. The problem might be older php version or older prestashop version or might be something else.

The errors that i get are :
2 errors
klarnapaymentsofficial (parse error in /modules/klarnapaymentsofficial/klarnapaymentsofficial.php)
klarnapaymentsofficial (class missing in /modules/klarnapaymentsofficial/klarnapaymentsofficial.php)