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Error upgrading

piotrpiotr New
in Vanilla 2.0 - 2.8

Followed the guide, got stuck when trying to run /utility/upgrade
PHP version = 5.6
Error: Fatal error: Call to a member function HasNewMethod() on null in /home/vhosts/audi-a2.nl/httpdocs/library/core/class.pluggable.php on line 188

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