Revision dea367fb-c949-40f5-b332-a3c5146901cb - Magento Stack Exchange

After enabled the developer mode, i always got this error while trying to edit one of my product or add new in back end:

> 1 exception(s): Exception #0
> (Magento\Framework\Config\Dom\ValidationException): Element 'body':
> Character content other than whitespace is not allowed because the
> content type is 'element-only'. Line: 206
> 
> Element 'arguments': Character content other than whitespace is not
> allowed because the content type is 'element-only'. Line: 213
> 
> Element 'action': Character content other than whitespace is not
> allowed because the content type is 'element-only'. Line: 227