Call to undefined method Illuminate\Support\Facades\Validator::resolver()
问题 What is it about ? I am using Laravel 5.2 and update the composer by running the following command composer require felixkiss/uniquewith-validator:2.* and then added the following to your providers array in config/app.php: 'providers' => array( // ... 'Felixkiss\UniqueWithValidator\UniqueWithValidatorServiceProvider', ), I did this because I am trying to implement Multiple column Unique Validation. I mean Composite Key Validation. I am following the instructions as mentioned here What's the