Fatal error: Uncaught Error: Interface 'PHPUnit_Framework_MockObject_Stub' not found in /var/www/html/a2billing/vendor/phpunit/phpunit-mock-objects/src/Framework/MockObject/Stub/ConsecutiveCalls.php:18 Stack trace: #0 {main} thrown in /var/www/html/a2billing/vendor/phpunit/phpunit-mock-objects/src/Framework/MockObject/Stub/ConsecutiveCalls.php on line 18