Not working on PHP 7.

[Eseperio]

This extension does not work under PHP7 and so on on yii2 2.0.13 and higher versions due to the use of word Object. It must be changed, object was deprecated.

[kiqeri]

@Eseperio Hi I resolved this issue by changing Object to BaseObject in the file:
\vendor\romka-chev\yii2-swiper\Slide.php

use yii\base\BaseObject;
....
class Slide extends BaseObject;