Fatal error: Uncaught Error: Using $this when not in object context in /var/www/andovercg/staging/wp-content/plugins/smart-slider-3/Nextend/SmartSlider3/Application/Admin/Layout/Block/Slide/LayerWindow/LayerWindow.php:25 Stack trace: #0 {main} thrown in /var/www/andovercg/staging/wp-content/plugins/smart-slider-3/Nextend/SmartSlider3/Application/Admin/Layout/Block/Slide/LayerWindow/LayerWindow.php on line 25