Page Error

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Hi All

Getting this error (and page not loading correctly - screenshot attached) when trying to Add User....

Catchable fatal error: Argument 1 passed to Zend_Locale_Data::setCache() must be an instance of Zend_Cache_Core, null given, called in /var/www/vhosts/mitongroup.com/httpdocs/updates/concrete5.5.1/concrete/single_pages/dashboard/users/add.php on line 65 and defined in /var/www/vhosts/mitongroup.com/httpdocs/updates/concrete5.5.1/concrete/libraries/3rdparty/Zend/Locale/Data.php on line 1443

Done a web search but can find nothing. Any ideas?

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