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Fix Error: Fatal error: Call to undefined function dom_import_simplexml() in /var/www/vhosts/ on line 182

While trying to upgrade concrete5 5.2.1 to

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.

The upgrade should complete successfully.