How to Fix Theme Switching Error in Magento 2.2.x

Theming is something that changes the whole shopping experience of your store with a topping of some stylish design elements and features that your default Magento store never had. But every time when you upgrade to latest Magento 2.x version, you will face some issue or difficulties while using your Magento store functionality. But due to its wide developer community issue will no longer remain unsolved.

Attachment 13675

for more: How to Fix Theme Switching Error in Magento 2.2.x