yii2 gii/giiant Exception 'yii\base\InvalidArgumentException' with message 'Invalid path alias: @backend/views'

Question

I recently added giiant to my Yii basic application. I run php yii gii/giiant-model --tableName=school --modelClass=School succesfully

But when I try to run php yii gii/giiant-crud --modelClass="app\models\School" --controllerClass="app\controllers\SchoolController" I get this error:

Exception 'yii\base\InvalidArgumentException' with message 'Invalid path alias: @backend/views'

Can someone help me up? Is there an alternative to giiant? (a gii based tool that create dropdowns for related tables?

I expect to run php yii gii/giiant-crud --modelClass="app\models\School" --controllerClass="app\controllers\SchoolController"

In web based tool as well as in CLI.