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Additional information:

Zend\Captcha\Exception\ExtensionNotLoadedException

File:
/var/www/promal/vendor/zendframework/zendframework/library/Zend/Captcha/Image.php:125
Message:
Image CAPTCHA requires GD extension
Stack trace:
#0 /var/www/promal/module/Home/src/Home/Form/ContactoForm.php(68): Zend\Captcha\Image->__construct(Array)
#1 /var/www/promal/module/Home/src/Home/Controller/IndexController.php(55): Home\Form\ContactoForm->__construct('form_contacto', '/captcha/')
#2 /var/www/promal/vendor/zendframework/zendframework/library/Zend/Mvc/Controller/AbstractActionController.php(83): Home\Controller\IndexController->contactoAction()
#3 [internal function]: Zend\Mvc\Controller\AbstractActionController->onDispatch(Object(Zend\Mvc\MvcEvent))
#4 /var/www/promal/vendor/zendframework/zendframework/library/Zend/EventManager/EventManager.php(468): call_user_func(Array, Object(Zend\Mvc\MvcEvent))
#5 /var/www/promal/vendor/zendframework/zendframework/library/Zend/EventManager/EventManager.php(207): Zend\EventManager\EventManager->triggerListeners('dispatch', Object(Zend\Mvc\MvcEvent), Object(Closure))
#6 /var/www/promal/vendor/zendframework/zendframework/library/Zend/Mvc/Controller/AbstractController.php(116): Zend\EventManager\EventManager->trigger('dispatch', Object(Zend\Mvc\MvcEvent), Object(Closure))
#7 /var/www/promal/vendor/zendframework/zendframework/library/Zend/Mvc/DispatchListener.php(113): Zend\Mvc\Controller\AbstractController->dispatch(Object(Zend\Http\PhpEnvironment\Request), Object(Zend\Http\PhpEnvironment\Response))
#8 [internal function]: Zend\Mvc\DispatchListener->onDispatch(Object(Zend\Mvc\MvcEvent))
#9 /var/www/promal/vendor/zendframework/zendframework/library/Zend/EventManager/EventManager.php(468): call_user_func(Array, Object(Zend\Mvc\MvcEvent))
#10 /var/www/promal/vendor/zendframework/zendframework/library/Zend/EventManager/EventManager.php(207): Zend\EventManager\EventManager->triggerListeners('dispatch', Object(Zend\Mvc\MvcEvent), Object(Closure))
#11 /var/www/promal/vendor/zendframework/zendframework/library/Zend/Mvc/Application.php(313): Zend\EventManager\EventManager->trigger('dispatch', Object(Zend\Mvc\MvcEvent), Object(Closure))
#12 /var/www/promal/public/index.php(20): Zend\Mvc\Application->run()
#13 {main}