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- 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
![](http://magento-store.tridhya.com/media/wysiwyg/blog57.png)
Answer: your custom module is missing core module Please put core module or replace core module for solve this error.
December 6, 2021 | View: 192
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