yii\base\InvalidConfigException: Either GD PHP extension with FreeType support or ImageMagick PHP extension with PNG support is required. in /var/www/example.com/basic/vendor/yiisoft/yii2/captcha/Captcha.php:162
Stack trace:
#0 /var/www/example.com/basic/vendor/yiisoft/yii2/captcha/Captcha.php(88): yii\captcha\Captcha::checkRequirements()
#1 /var/www/example.com/basic/vendor/yiisoft/yii2/base/BaseObject.php(109): yii\captcha\Captcha->init()
#2 [internal function]: yii\base\BaseObject->__construct(Array)
#3 /var/www/example.com/basic/vendor/yiisoft/yii2/di/Container.php(384): ReflectionClass->newInstanceArgs(Array)
#4 /var/www/example.com/basic/vendor/yiisoft/yii2/di/Container.php(156): yii\di\Container->build('yii\\captcha\\Cap...', Array, Array)
#5 /var/www/example.com/basic/vendor/yiisoft/yii2/BaseYii.php(349): yii\di\Container->get('yii\\captcha\\Cap...', Array, Array)
#6 /var/www/example.com/basic/vendor/yiisoft/yii2/base/Widget.php(137): yii\BaseYii::createObject(Array)
#7 /var/www/example.com/basic/vendor/yiisoft/yii2/widgets/ActiveField.php(782): yii\base\Widget::widget(Array)
#8 /var/www/example.com/basic/vendor/kartik-v/yii2-widget-activeform/src/ActiveField.php(822): yii\widgets\ActiveField->widget('yii\\captcha\\Cap...', Array)
#9 /var/www/example.com/basic/vendor/cinghie/yii2-user-extended/views/registration/_two_column.php(122): kartik\form\ActiveField->widget('yii\\captcha\\Cap...', Array)
#10 /var/www/example.com/basic/vendor/yiisoft/yii2/base/View.php(348): require('/var/www/exampl...')
#11 /var/www/example.com/basic/vendor/yiisoft/yii2/base/View.php(257): yii\base\View->renderPhpFile('/var/www/exampl...', Array)
#12 /var/www/example.com/basic/vendor/yiisoft/yii2/base/View.php(156): yii\base\View->renderFile('/var/www/exampl...', Array, NULL)
#13 /var/www/example.com/basic/vendor/cinghie/yii2-user-extended/views/registration/register.php(18): yii\base\View->render('_two_column', Array)
#14 /var/www/example.com/basic/vendor/yiisoft/yii2/base/View.php(348): require('/var/www/exampl...')
#15 /var/www/example.com/basic/vendor/yiisoft/yii2/base/View.php(257): yii\base\View->renderPhpFile('/var/www/exampl...', Array)
#16 /var/www/example.com/basic/vendor/yiisoft/yii2/base/View.php(156): yii\base\View->renderFile('/var/www/exampl...', Array, Object(dektrium\user\controllers\RegistrationController))
#17 /var/www/example.com/basic/vendor/yiisoft/yii2/base/Controller.php(384): yii\base\View->render('register', Array, Object(dektrium\user\controllers\RegistrationController))
#18 /var/www/example.com/basic/vendor/dektrium/yii2-user/controllers/RegistrationController.php(147): yii\base\Controller->render('register', Array)
#19 [internal function]: dektrium\user\controllers\RegistrationController->actionRegister()
#20 /var/www/example.com/basic/vendor/yiisoft/yii2/base/InlineAction.php(57): call_user_func_array(Array, Array)
#21 /var/www/example.com/basic/vendor/yiisoft/yii2/base/Controller.php(157): yii\base\InlineAction->runWithParams(Array)
#22 /var/www/example.com/basic/vendor/yiisoft/yii2/base/Module.php(528): yii\base\Controller->runAction('register', Array)
#23 /var/www/example.com/basic/vendor/yiisoft/yii2/web/Application.php(103): yii\base\Module->runAction('user/registrati...', Array)
#24 /var/www/example.com/basic/vendor/yiisoft/yii2/base/Application.php(386): yii\web\Application->handleRequest(Object(yii\web\Request))
#25 /var/www/example.com/basic/web/index.php(12): yii\base\Application->run()
#26 {main}