Have issue with API+Graphql

[safarovitch]

After installing rest-api package I also wanted to add graphql pckage to my bagisto installation and faced this issue on post autoload dump.

Illuminate\Foundation\ComposerScripts::postAutoloadDump
@php artisan package:discover --ansi
PHP Fatal error: Access level to Webkul\RestApi\Exceptions\Handler::handleAuthenticationException() must be protected (as in class Webkul\Core\Exceptions\Handler) or weaker in /home/testwyzoshop/test.wyzo.shop/vendor/bagisto/rest-api/src/Exceptions/Handler.php on line 35
PHP Fatal error: Uncaught ReflectionException: Class "Webkul\RestApi\Exceptions\Handler" does not exist in /home/testwyzoshop/test.wyzo.shop/vendor/laravel/framework/src/Illuminate/Container/Container.php:944