How to fix «Overriding view file `app/design/frontend/<package>/<theme>/Magento_Checkout/layout/override/theme/Magento/blank/checkout_index_index.xml` does not match to any of the files»?

dmitrii_fediuk · January 31, 2018, 3:01am

Magento 2.0.x contains the app/design/frontend/Magento/blank/Magento_Checkout/layout/checkout_index_index.xml layout.
Magento >= 2.1 does not contain this layout:
github.com/magento/magento2/tree/2.1.0/app/design/frontend/Magento/blank/Magento_Checkout.

So you need to mode the contents of your app/design/frontend/<package>/<theme>/Magento_Checkout/layout/override/theme/Magento/blank/checkout_index_index.xml file to the app/design/frontend/<package>/<theme>/Magento_Checkout/layout/checkout_index_index.xml file.