Warning: include(KiTT.php): failed to open stream: No such file or directory

Question

I am trying to upgrade a Magento installation from 1.8.1.0 to 1.9.3.2. I have followed the guide on Upgrade Roadmap for Magento Community Edition (CE) 1.8 or 1.9 and I am now checking if the system is working as intended.

I get the following error in apache error log when going to the root path of the shop. Klarna Payment extension is a module that implements Klarna payment for the Magento installation.

[Tue May 23 14:45:59.183592 2017] [:error] [pid 14798] [client 111.222.333.444:55470] PHP Fatal error:  Class 'KiTT' not found in /path_to_magento_shop/app/code/community/Klarna/KlarnaPaymentModule/Helper/Api.php on line 83

The KiTT library is present in lib/:

$ find lib -maxdepth 1 -ls | grep KiTT
3148215    4 dr-xr-x---  10 myuser www-data     4096 Mar  9 13:32 lib/KiTT

Answer 1

This was an easy one... The directory lib/KiTT was present, but lib/KiTT.php was missing. Silly...