Exception printing is disabled by default for security reasons Magento 2

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Your store is running Magento 2, and when installing new extensions, setting configuration or even server memory is overloaded. You may get this error Exception printing is disabled by default for security reasons Magento 2. It is a quite common error, but you may still not know exactly what kind of problem out there. Follow this guide to show the full message.

ERROR: There has been an error processing your request

You may experience the error as stated in the following text:

There has been an error processing your request
Exception printing is disabled by default for security reasons.
Error log record number: 1234567890

Like this screenshot

Exception printing is disabled by default for security reasons

Enable Exception printing in Magento

In this article, we will give the solution for

Enable Exception printing in Magento 2
Enable Exception printing in Magento 1

Enable Exception printing in Magento 2

It is similar to Magento 1 but it is located in different folder pub/errors

Please rename the file pub/errors/local.xml.sample to pub/errors/local.xml. See trace result

Exception printing is disabled by default for security reasons Magento 2

You can go to var/report and get the list of error report.

There are similar errors:

a:4:{i:0;s:46:"SQLSTATE[HY000] [1049] Unknown database 'ce21'";i:1;s:4514:"#0 \vendor\magento\zendframework1\library\Zend\Db\Adapter\Pdo\Mysql.php(111): Zend_Db_Adapter_Pdo_Abstract->_connect()
#1 \vendor\magento\framework\DB\Adapter\Pdo\Mysql.php(340): Zend_Db_Adapter_Pdo_Mysql->_connect()
#2 \vendor\magento\zendframework1\library\Zend\Db\Adapter\Abstract.php(861): Magento\Framework\DB\Adapter\Pdo\Mysql->_connect()
#3 \vendor\magento\zendframework1\library\Zend\Db\Adapter\Abstract.php(931): Zend_Db_Adapter_Abstract->quote('1', NULL)
#4 \vendor\magento\framework\DB\Adapter\Pdo\Mysql.php(1363): Zend_Db_Adapter_Abstract->quoteInto('`store`.`store_...', '1', NULL, NULL)
#5 \vendor\magento\zendframework1\library\Zend\Db\Select.php(1007): Magento\Framework\DB\Adapter\Pdo\Mysql->quoteInto('`store`.`store_...', '1', NULL)
#6 \vendor\magento\zendframework1\library\Zend\Db\Select.php(477): Zend_Db_Select->_where('`store`.`store_...', '1', NULL, true)
#7 \vendor\magento\framework\DB\Select.php(115): Zend_Db_Select->where('`store`.`store_...', '1', NULL)
#8 \vendor\magento\framework\Model\ResourceModel\Db\AbstractDb.php(367): Magento\Framework\DB\Select->where('`store`.`store_...', '1')
#9 \vendor\magento\module-store\Model\ResourceModel\Store.php(168): Magento\Framework\Model\ResourceModel\Db\AbstractDb->_getLoadSelect('store_id', '1', Object(Magento\Store\Model\Store\Interceptor))
#10 \vendor\magento\framework\Model\ResourceModel\Db\AbstractDb.php(341): Magento\Store\Model\ResourceModel\Store->_getLoadSelect('store_id', '1', Object(Magento\Store\Model\Store\Interceptor))
#11 \var\generation\Magento\Store\Model\ResourceModel\Store\Interceptor.php(89): Magento\Framework\Model\ResourceModel\Db\AbstractDb->load(Object(Magento\Store\Model\Store\Interceptor), '1', NULL)
#12 \vendor\magento\framework\Model\AbstractModel.php(531): Magento\Store\Model\ResourceModel\Store\Interceptor->load(Object(Magento\Store\Model\Store\Interceptor), '1', NULL)
#13 \vendor\magento\module-store\Model\Store.php(488): Magento\Framework\Model\AbstractModel->load('1', NULL)
#14 \var\generation\Magento\Store\Model\Store\Interceptor.php(24): Magento\Store\Model\Store->load('1', NULL)
#15 \vendor\magento\module-store\Model\StoreRepository.php(89): Magento\Store\Model\Store\Interceptor->load('1')
#16 \vendor\magento\module-store\Model\StoreRepository.php(103): Magento\Store\Model\StoreRepository->getById('1')
#17 \vendor\magento\module-store\Model\StoreResolver.php(167): Magento\Store\Model\StoreRepository->getActiveStoreById('1')
#18 \vendor\magento\module-store\Model\StoreResolver.php(105): Magento\Store\Model\StoreResolver->getDefaultStoreById('1')
#19 \vendor\magento\module-store\Model\StoreManager.php(151): Magento\Store\Model\StoreResolver->getCurrentStoreId()
#20 \vendor\magento\module-store\App\Request\PathInfoProcessor.php(39): Magento\Store\Model\StoreManager->getStore('')
#21 \vendor\magento\module-backend\App\Request\PathInfoProcessor.php(47): Magento\Store\App\Request\PathInfoProcessor->process(Object(Magento\Framework\App\Request\Http), '/')
#22 \var\generation\Magento\Backend\App\Request\PathInfoProcessor\Proxy.php(95): Magento\Backend\App\Request\PathInfoProcessor->process(Object(Magento\Framework\App\Request\Http), '/')
#23 \vendor\magento\framework\App\Request\Http.php(165): Magento\Backend\App\Request\PathInfoProcessor\Proxy->process(Object(Magento\Framework\App\Request\Http), '/')
#24 \vendor\magento\framework\HTTP\PhpEnvironment\Request.php(209): Magento\Framework\App\Request\Http->setPathInfo()
#25 \vendor\magento\framework\App\Request\Http.php(208): Magento\Framework\HTTP\PhpEnvironment\Request->getPathInfo()
#26 \vendor\magento\framework\App\Http.php(130): Magento\Framework\App\Request\Http->getFrontName()
#27 \vendor\magento\framework\App\Bootstrap.php(258): Magento\Framework\App\Http->launch()
#28 \index.php(39): Magento\Framework\App\Bootstrap->run(Object(Magento\Framework\App\Http))
#29 {main}";s:3:"url";s:6:"/ce21/";s:11:"script_name";s:15:"/ce21/index.php";}

2.1. Cache issue

a:5:{i:0;s:71:"Could not determine temp directory, please specify a cache_dir manually";i:1;s:4546:"#0 /home/host/domains/example.com/public_html/lib/Zend/Cache/Backend.php(197): Zend_Cache::throwException('Could not deter...')

2.2. Session issue

Warning: SessionHandler::read(): open(/var/lib/php/session/sess_cvevqn06desuj80, O_RDWR) failed: Permission denied (13) in /var/www/vhosts/[site]/httpdocs/vendor/magento/framework/Session/SaveHandler.php on line 74

2.3. Registry issue

a:5:{i:0;s:63:"Mage registry key "_singleton/megamenu/observer" already exists";i:1;s:2654:"#0 /home/host/public_html/magento2/app/Mage.php(223): Mage::throwException('Mage registry k...')
#1 /home/host/public_html/magento2/app/Mage.php(477): Mage::register('_singleton/mega...', false)
#2 /home/host/public_html/magento2/app/code/core/Mage/Core/Model/App.php(1335): Mage::getSingleton('megamenu/observ...')
#3 /home/host/public_html/magento2/app/Mage.php(448): Mage_Core_Model_App->dispatchEvent('core_layout_blo...', Array)
#4 /home/host/public_html/magento2/app/code/core/Mage/Core/Model/Layout.php(459): Mage::dispatchEvent('core_layout_blo...', Array)
#5 /home/host/public_html/magento2/app/code/core/Mage/Core/Model/Layout.php(472): Mage_Core_Model_Layout->createBlock('page/html', 'root')
#6 /home/host/public_html/magento2/app/code/core/Mage/Core/Model/Layout.php(239): Mage_Core_Model_Layout->addBlock('page/html', 'root')
#7 /home/host/public_html/magento2/app/code/core/Mage/Core/Model/Layout.php(205): Mage_Core_Model_Layout->_generateBlock(Object(Mage_Core_Model_Layout_Element), Object(Mage_Core_Model_Layout_Element))
#8 /home/host/public_html/magento2/app/code/core/Mage/Core/Controller/Varien/Action.php(344): Mage_Core_Model_Layout->generateBlocks()
#9 /home/host/public_html/magento2/app/code/core/Mage/Cms/Helper/Page.php(113): Mage_Core_Controller_Varien_Action->generateLayoutBlocks()
#10 /home/host/public_html/magento2/app/code/core/Mage/Cms/Helper/Page.php(52): Mage_Cms_Helper_Page->_renderPage(Object(Mage_Cms_IndexController), 'home')
#11 /home/host/public_html/magento2/app/code/core/Mage/Cms/controllers/IndexController.php(45): Mage_Cms_Helper_Page->renderPage(Object(Mage_Cms_IndexController), 'home')
#12 /home/host/public_html/magento2/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Mage_Cms_IndexController->indexAction()
#13 /home/host/public_html/magento2/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('index')
#14 /home/host/public_html/magento2/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#15 /home/host/public_html/magento2/app/code/core/Mage/Core/Model/App.php(365): Mage_Core_Controller_Varien_Front->dispatch()
#16 /home/host/public_html/magento2/app/Mage.php(684): Mage_Core_Model_App->run(Array)
#17 /home/host/public_html/magento2/index.php(84): Mage::run('', 'store')
#18 {main}";s:3:"url";s:19:"/magento2/";s:11:"script_name";s:28:"/magento2/index.php";s:4:"skin";s:7:"default";}

Enable Exception printing in Magento 1

You may rename file errors/local.xml.sample to errors/local.xml

Then Exception printing is enabled, so you can see trace as the following:

Exception printing is disabled by default for security reasons Magento 1

That’s all for you to understand the problem of disabled exception printing by default for security reasons in Magento. We have shown you the solutions for both Magento 2 and Magento 1, so good luck in putting them into practice! We can’t wait to hear your results, so please leave comments for us.