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Notice: Undefined index: id in
/home/208806.cloudwaysapps.com/mnaanucsmd/public_html/vendor/magento/module-config/Model/Config/Structure/Element/Iterator.php
on line 63

Error log record number: 1370744923540.

Got this error after trying to install a new module/extension mageplaza SMTP extension.

My iterator.php

public function setElements(array $elements, $scope)

    {

        $this->_elements = $elements;

        $this->_scope = $scope;

        if (count($elements)) {

            $lastElement = end($elements);

            $this->_lastId = $lastElement['id']; //<--- Line 63 is here

        }

    }

Check that Mageplaza_Core module installed and enabled:

From the Magento root directory type:

php bin/magento module:status Mageplaza_Core

You should see something like:

Module is enabled

In case you seeing something other you should install it (type from the Magento root directory):

composer require mageplaza/module-core

then enable it:

php bin/magento module:enable Mageplaza_Core

Note: On my server it looks like this:

and make update:

php bin/magento setup:upgrade

php bin/magento setup:di:compile

update static files if needed:

php bin/magento setup:static-content:deploy

After that it should work as expected.

Note: do not forget to run all commands from the correspondent web-server's user to avoid permissions issue.