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The following php error is likely to occur when your site PHP version has been changed from PHP 5.xx  to the new PHP 7 version.

The culprit is likely to be the file "php.ini" which was left and wrongly added at root level.

Notice: Undefined variable: _SERVER in /home/yoursitename/public_html/libraries/cms.php

To correct this issue, simply rename your php.ini to phpold.ini.txt and it should do the trick.

Please note that Siteground (hosting provider), tends to automatically add a php.ini at root folder during site transfer or creation of a new CMS site.

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