Magento 2.2.0 upgrade, error attribute type is not allowed

Question

I was able to upgrade a Magento store from 2.1.6 to 2.2.0. The backend is working very good, but I am encountering an exception on the front office.

The exception message says: Element 'block', attribute 'type': The attribute 'type' is not allowed.

The whole situation is described in the next post from GitHub: https://github.com/magento/magento2/issues/11839

I'm new in Magento. Could give me a link which describes from where should I remove the invalid type attribute or other attributes or from where can I refactor it?

Answer 1

Those lines are most likely ones in your layout XMLs:

Element 'block', attribute 'type': The attribute 'type' is not allowed.
Line: 776

Element 'block', attribute 'type': The attribute 'type' is not allowed.
Line: 783

Element 'block', attribute 'type': The attribute 'type' is not allowed.
Line: 816

Most likely in layout XMLs you have declarations like

<block type="..."

Which does not correspond to lib/internal/Magento/Framework/View/Layout/etc/elements.xsd and need to be replaced to

<block class="..."

Answer 2

After I updated it by operating the composer, it no longer works properly. The error report is as follows:

1 exception(s):
Exception #0 (Magento\Framework\Config\Dom\ValidationException): Element 'block', attribute 'display': The attribute 'display' is not allowed.
Line: 689


Exception #0 (Magento\Framework\Config\Dom\ValidationException): Element 'block', attribute 'display': The attribute 'display' is not allowed.
Line: 689

#0 /vendor/magento/framework/Config/Dom.php(115): Magento\Framework\Config\Dom->_initDom('<layout xmlns:x...')

Why is that ？