Magento admin Zend_Acl_Exception

Boon Chye Phang
Boon Chye Phang used Ask the Experts™
I have incidents when going to Magento admin dashboard triggered with many similar exceptions under Zend_Acl_Exception class:

It has the same stack trace:
Zend_Acl_Exception.Zend_Acl_Exception (C:\Web\lib\Zend\Acl.php:365)
Zend_Acl.get (C:\Web\lib\Zend\Acl.php:846)
Zend_Acl.isAllowed (C:\Web\app\code\core\Mage\Admin\Model\Session.php:200)
Mage_Admin_Model_Session.isAllowed (C:\Web\app\code\core\Mage\Adminhtml\Block\Page\Menu.php:247)
Mage_Adminhtml_Block_Page_Menu._checkAcl (C:\Web\app\code\core\Mage\Adminhtml\Block\Page\Menu.php:144)

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Can someone help to explain what are these exceptions about? And how to fix these? I am using Magento
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Happened to see a tweet that the configuration of xdebug.show_exception_trace = 1 might be causing the issue:
Where is the file that having such configuration?

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