Fatal error: Uncaught Error: Class "Facebook\Helpers\FacebookSignedRequestFromInputHelper" not found in /mnt/VenusReview/review/lyrasoft/dva/master/vendor/facebook/graph-sdk/tests/Fixtures/FooSignedRequestHelper.php:28 Stack trace: #0 {main} thrown in /mnt/VenusReview/review/lyrasoft/dva/master/vendor/facebook/graph-sdk/tests/Fixtures/FooSignedRequestHelper.php on line 28