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After fresh installation of 2.2.0 version it gives:
Class Magento\Framework\Session\SaveHandler contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (SessionHandlerInterface:: ) in vendor\magento\framework\Session\SaveHandler.php on line 16
Open this file
vendor\magento\framework\Session\SaveHandlerInterface.php
Look for
interface SaveHandlerInterface extends \SessionHandlerInterface
Replace it with
interface SaveHandlerInterface extends \Zend_Session_SaveHandler_Interface
