Hi,
That would indicate that the file administrator/components/com_hikashop/helper/pagination.php could not be updated.
Please edit that file via FTP and look at the begining of the version. The version number of that file should be written. If it's not 4.2.3 then my theory is correct. In that case, rename the file via FTP, download the install package of the latest version on our website and install it again and it will add the file of the latest version there.
If it's not coming from this, then I don't know. I would need to do some debugging to understand better the situation. So I would need a link to the page with the issue, a backend access and a FTP access. You can provide that via our contact form along with a link to this thread for reference:
www.hikashop.com/support/contact-us.html