Fatal error: Uncaught Error: Call to undefined function is_external() in /home/opencart/public_html/system/library/cartbuttonaction.php:118 Stack trace: #0 /home/opencart/public_html/storage/modification/catalog/controller/product/product.php(243): CartButtonAction->product('131', '0.0000', '') #1 /home/opencart/public_html/storage/modification/system/engine/action.php(79): ControllerProductProduct->index() #2 /home/opencart/public_html/catalog/controller/startup/router.php(25): Action->execute(Object(Registry)) #3 /home/opencart/public_html/storage/modification/system/engine/action.php(79): ControllerStartupRouter->index() #4 /home/opencart/public_html/system/engine/router.php(67): Action->execute(Object(Registry)) #5 /home/opencart/public_html/system/engine/router.php(56): Router->execute(Object(Action)) #6 /home/opencart/public_html/system/framework.php(168): Router->dispatch(Object(Action), Object(Action)) #7 /home/opencart/public_html/system/startup.php(104): require_once('/home/opencart/...') #8 /home/opencart/publi in /home/opencart/public_html/system/library/cartbuttonaction.php on line 118