Fatal error: Uncaught Error: Class 'PhpSpec\ObjectBehavior' not found in /var/www/html/a2billing/vendor/phpspec/prophecy/spec/Prophecy/Prediction/CallbackPredictionSpec.php:9 Stack trace: #0 {main} thrown in /var/www/html/a2billing/vendor/phpspec/prophecy/spec/Prophecy/Prediction/CallbackPredictionSpec.php on line 9