Severity: error --> Exception: Class ’DOMDocument’ not found /var/www/ezlogin/application/third_party/saml/src/Saml2/IdPMetadata Parser.php 113

Severity: error --> Exception: Class 'DOMDocumen t' not found /var/www/ezlogin/application/third_party/saml/src/Saml2/IdPMetadata Parser.php 113

You need to install the DOM extension. You can do so on Debian / Ubuntu using:

sudo apt-get install php-dom/php-xml

And on Centos / Fedora / Red Hat:

yum install php-xml

If you get conflicts between PHP 5 and PHP 5.3 packages, you could try to see if the php53-xml package exists instead.