Fatal error: Class 'Whoops\Handler\Handler' not found in /var/www/html/dev/spa/vendor/filp/whoops/src/Whoops/Handler/CallbackHandler.php on line 17

Call Stack:
    0.0004     237232   1. {main}() /var/www/html/dev/spa/vendor/filp/whoops/src/Whoops/Handler/CallbackHandler.php:0