Exception #0 (Exception): Notice: undefined index: id in vendor\magento\module-config\model\config\structure\e lement\iterator.php on line 63

Exception #0 (Exception): Notice: undefined index: id in          vendor\magento\module-config\model\config\structure\e lement\iterator.php on line 63

-when you get error like this in admin config

Answer: your custom module is missing core module Please put core module or replace core module for solve this error.



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