CODE EXAMPLE FOR SHELL

barryvdh dompdf file_getcontents passing null

If use  `barryvdh/laravel-dompdf`, se to `^1.0.0` version
If use `dompdf/dompdf` set to `^1.2.2`

#on composer.json:
"barryvdh/laravel-dompdf": "^1.0.0"

#Or 
composer require barryvdh/laravel-dompdf:"^1.0.0"