Fatal error: Uncaught Error: Call to undefined function Nextend\Framework\Platform\WordPress\is_admin() in /var/www/andovercg/staging/wp-content/plugins/smart-slider-3/Nextend/Framework/Platform/WordPress/PlatformWordPress.php:19 Stack trace: #0 /var/www/andovercg/staging/wp-content/plugins/smart-slider-3/Nextend/Framework/Platform/Platform.php(19): Nextend\Framework\Platform\WordPress\PlatformWordPress->__construct() #1 /var/www/andovercg/staging/wp-content/plugins/smart-slider-3/Nextend/Framework/Pattern/SingletonTrait.php(12): Nextend\Framework\Platform\Platform->__construct() #2 /var/www/andovercg/staging/wp-content/plugins/smart-slider-3/Nextend/Framework/Platform/Platform.php(89): Nextend\Framework\Platform\Platform::getInstance() #3 /var/www/andovercg/staging/wp-content/plugins/smart-slider-3/Nextend/Autoloader.php(194): require('...') #4 /var/www/andovercg/staging/wp-content/plugins/smart-slider-3/Nextend/Autoloader.php(175): Nextend\Autoloader->requireFile() #5 /var/www/andovercg/staging/wp-content/plugins/smart-slider-3/Nextend/Autoloader.php(128): Nextend\Autoloader->loadMappedFile() #6 /var/www/andovercg/staging/wp-content/plugins/smart-slider-3/Nextend/SmartSlider3/SmartSlider3.php(30): Nextend\Autoloader->loadClass() #7 /var/www/andovercg/staging/wp-content/plugins/smart-slider-3/Nextend/Framework/Pattern/SingletonTrait.php(16): Nextend\SmartSlider3\SmartSlider3->init() #8 /var/www/andovercg/staging/wp-content/plugins/smart-slider-3/Nextend/Framework/Pattern/SingletonTrait.php(12): Nextend\SmartSlider3\SmartSlider3->__construct() #9 [internal function]: Nextend\SmartSlider3\SmartSlider3::getInstance() #10 /var/www/andovercg/staging/wp-content/plugins/smart-slider-3/Nextend/Autoloader.php(45): call_user_func_array() #11 /var/www/andovercg/staging/wp-content/plugins/smart-slider-3/Nextend/Autoloader.php(55): Nextend\Autoloader->__construct() #12 /var/www/andovercg/staging/wp-content/plugins/smart-slider-3/Nextend/Autoloader.php(203): Nextend\Autoloader::getInstance() #13 {main} thrown in /var/www/andovercg/staging/wp-content/plugins/smart-slider-3/Nextend/Framework/Platform/WordPress/PlatformWordPress.php on line 19