Why error messages doesn't Appear in Laravel views?

I want to pass custom validation messages to my view using a custom request when storing a role.

I have create a new Request called StoreRoleRequest

<?php

namespace App\Http\Requests;

use App\Http\Requests\Request;
use Illuminate\Contracts\Validation\Validator;

class StoreRoleRequest extends Request
{
    public function authorize()
    {
        return true;
    }

    public function rules()
    {
        return [
            'name'   => 'required'
        ];
    }

    protected function formatErrors(Validator $validator)
    {
        return $validator->errors()->all();
    }

    public function messages()
    {
        return [
            'name.required' => 'the name of the Role is mandatory',
        ];
    }
}

And then pass this custom Request to my store function in the RoleController like this:

public function store(StoreRoleRequest $request)
{
    Role::create($request->all());
    return redirect(route('role.index'));
}

I have a view that show the create role form where the validation seems to work properly but without showing me error even if i call them into the view like this:

{!! Former::open()->action(route('role.store')) !!}
@if (count($errors->all()))
    <div class="alert alert-danger">
        @foreach ($errors->all() as $error)
            <li></li>
        @endforeach
    </div>
@endif
{!! Former::text('name')->label('Groupe name')   !!}
{!! Former::text('display_name')->label('Displayed name')   !!}
{!! Former::text('description')->label('Description')   !!}

{!! Former::actions( Button::primary('Save')->submit(),
                    Button::warning('Clear')->reset()  ,
                    Button::danger('Close')->asLinkTo('#')->withAttributes(['data-dismiss' => 'modal'])
 )!!}
{!! Former::close() !!}

Has anyone an idea why the errors doesn't appear into the view ? am I looping something inside the custom Request ?

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