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Fatal Error when opening admin page after fresh installation

Fatal Error when opening admin page after fresh installation

Hi All,

I was able to successfully install Magento 2. When I try accessing admin URL it is giving 404 page not found error. When I tried accessing it in Developer mode, getting following error. I'm using following tech stack:

Magento-CE-2.1.2
PHP Version 7.0.12
Apache/2.4.23 (Win64)
MYSQL 5.7.16
OS Windows10 x64

Please help.

 

Fatal error: Uncaught Magento\Framework\Exception\LocalizedException: Invalid Document Element 'item': Duplicate key-sequence ['default'] in key identity-constraint 'argumentItemName'. Line: 608 in C:\Apache24\htdocs\vendor\magento\framework\Config\Reader\Filesystem.php:160 Stack trace: #0 C:\Apache24\htdocs\vendor\magento\framework\Config\Reader\Filesystem.php(127): Magento\Framework\Config\Reader\Filesystem->_readFiles(Object(Magento\Framework\Config\FileIterator)) #1 C:\Apache24\htdocs\vendor\magento\framework\App\ObjectManagerFactory.php(282): Magento\Framework\Config\Reader\Filesystem->read('primary') #2 C:\Apache24\htdocs\vendor\magento\framework\App\ObjectManagerFactory.php(142): Magento\Framework\App\ObjectManagerFactory->_loadPrimaryConfig(Object(Magento\Framework\App\Filesystem\DirectoryList), Object(Magento\Framework\Filesystem\DriverPool), Object(Magento\Framework\ObjectManager\Config\Mapper\Dom), 'developer') #3 C:\Apache24\htdocs\vendor\magento\framework\App\Bootstrap.php(385): Magento\Framework\App\Object in C:\Apache24\htdocs\vendor\magento\framework\App\ObjectManagerFactory.php on line 284'developer') #3 C:\Apache24\htdocs\vendor\magento\framework\App\Bootstrap.php(385): Magento\Framework\App\Object in C:\Apache24\htdocs\vendor\magento\framework\App\ObjectManagerFactory.php on line 284