slo_nik: 'yii2images' => [
'class' => 'rico\yii2images\Module',
//be sure, that permissions ok
//if you cant avoid permission errors you have to create "images" folder in web root manually and set 777 permissions
'imagesStorePath' => 'upload/store', //path to origin images
'imagesCachePath' => 'upload/cache', //path to resized copies
'graphicsLibrary' => 'GD', //but really its better to use 'Imagick'
'placeHolderPath' => '@webroot/images/placeHolder.png', // if you want to get placeholder when image not exists, string will be processed by Yii::getAlias
],