Hi, @danieletuteri I had the same issue and my hosting provider suggests me to do what you did.
I didn’t understand her at first so I copy the file index.php from my other website that doesn’t have this error to my current index.php and replace it on the error website.
Then I delete the kclient.php => Everything working fine now.
Before replace and delete the files, you can download them to your local computer in case of any errors.
