When installing Magento 2, it knocks out: Fatal error: Class Magento \ Framework \ DataObject contains 2 methods (in ArrayAccess ::, ArrayAccess :: AsyncInsert) in F: \ App \ OpenServer \ domains \ madento \ vendor \ magento \ framework \ DataObject.php on line 14

    1 answer 1

    Magento version 2.xx and php?

    You can try to declare these methods as abstract in the interface, or implement their functionality in this class (but this does not solve the essence of the problem but only this bug).

    Such an error has never come across when installing from 2.0 to 2.1.3.