Found solution:
Need change line 96:
wp_enqueue_style( $this->plugin_name . ‘-main’, plugin_dir_url( __FILE__ ) . ‘css/poka-review-main.css’, array(), filemtime( plugin_dir_url( __FILE__ ) . ‘css/poka-review-main.css’ ), ‘all’ );
To:
wp_enqueue_style( $this->plugin_name . ‘-main’, plugin_dir_url( __FILE__ ) . ‘css/poka-review-main.css’, array(), filemtime( plugin_dir_path( __FILE__ ) . ‘css/poka-review-main.css’ ), ‘all’ );