Error on import multisite backup
Have you tried running your update.php file? 

(https://www.drupal.org/upgrade/running-update-php)

II. Run update.php
In your web browser navigate to the directory where Drupal is installed:

http://www.example.com/update.php

or

http://www.example.com/test_site/update.php  (if you are upgrading a test site)
The update script should only be run once. It will complete all the updates at once. If prompted for which version, choose the closest starting version that makes sense for you.

This will update the default Drupal and contributed module database tables automatically (versions prior to 4.7 will require manual upgrade of the contributed modules). Once the script has stopped loading, be sure to scroll to the bottom to look for errors.