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Fix Error: Fatal error: Call to undefined function dom_import_simplexml() in /var/www/vhosts/www.yoursite.com/updates/concrete5.6.0.1/concrete/core/controllers/single_pages/upgrade.php on line 182

While trying to upgrade concrete5 5.2.1 to 5.6.0.1

You are probably missing a phpXML library. 

On Scientific Linux I fixed this by running the following commands. 

1. sudo  yum install php-xml php-xmlrpc  -y

2. service httpd restart

Navigate back to your "upgrade" page. 

http://www.yourwebsite.com/index.php/tools/required/upgrade?source=dashboard_update

The upgrade should complete successfully.