first upload all files

Modules/Attribute/Http/Controllers/Admin/AttributeController.php

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+<?php
+
+namespace Modules\Attribute\Http\Controllers\Admin;
+
+use Modules\Admin\Traits\HasCrudActions;
+use Modules\Attribute\Entities\Attribute;
+use Modules\Attribute\Http\Requests\SaveAttributeRequest;
+
+class AttributeController
+{
+    use HasCrudActions;
+
+    /**
+     * Model for the resource.
+     *
+     * @var string
+     */
+    protected $model = Attribute::class;
+
+    /**
+     * The relations to eager load on every query.
+     *
+     * @var array
+     */
+    protected $with = ['values'];
+
+    /**
+     * Label of the resource.
+     *
+     * @var string
+     */
+    protected $label = 'attribute::admin.attribute';
+
+    /**
+     * View path of the resource.
+     *
+     * @var string
+     */
+    protected $viewPath = 'attribute::admin.attributes';
+
+    /**
+     * Form requests for the resource.
+     *
+     * @var array
+     */
+    protected $validation = SaveAttributeRequest::class;
+}

Modules/Attribute/Http/Controllers/Admin/AttributeSetController.php

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+<?php
+
+namespace Modules\Attribute\Http\Controllers\Admin;
+
+use Modules\Admin\Traits\HasCrudActions;
+use Modules\Attribute\Entities\AttributeSet;
+use Modules\Attribute\Http\Requests\SaveAttributeSetRequest;
+
+class AttributeSetController
+{
+    use HasCrudActions;
+
+    /**
+     * Model for the resource.
+     *
+     * @var string
+     */
+    protected $model = AttributeSet::class;
+
+    /**
+     * Label of the resource.
+     *
+     * @var string
+     */
+    protected $label = 'attribute::attribute_sets.attribute_set';
+
+    /**
+     * View path of the resource.
+     *
+     * @var string
+     */
+    protected $viewPath = 'attribute::admin.attribute_sets';
+
+    /**
+     * Form requests for the resource.
+     *
+     * @var array
+     */
+    protected $validation = SaveAttributeSetRequest::class;
+}