class-wp-internal-pointers.php

I was in the process of updating to 4.4 and the install stalled on Copying files…

Eventually, my website came out of maintenance mode and is live, however when I attempt to login I am getting the error below. What do I need to do to fix this please?

How to fix: Warning: require_once(/homepages/35/d183536492/htdocs/snapshotphotobooth/wp-admin/includes/class-wp-internal-pointers.php): failed to open stream: No such file or directory in /homepages/35/d183536492/htdocs/snapshotphotobooth/wp-admin/includes/template.php on line 15

Fatal error: require_once(): Failed opening required ‘/homepages/35/d183536492/htdocs/snapshotphotobooth/wp-admin/includes/class-wp-internal-pointers.php’ (include_path=’.:/usr/lib/php5.5′) in /homepages/35/d183536492/htdocs/snapshotphotobooth/wp-admin/includes/template.php on line 15

Thanks,
Keith