Exception #0 (Magento\Framework\Config\Dom\ValidationException): Element 'link', att

[pantelisgr]

i see this error when i enable developer mode at frontend

1 exception(s):
Exception #0 (Magento\Framework\Config\Dom\ValidationException): Element 'link', attribute 'async': The attribute 'async' is not allowed.
Line: 782

how can i find what file cause this?

in production mode everything works.

[Gaurav_Jain02]

Hello @pantelisgr 

Did you try this?
https://magento.stackexchange.com/questions/302491/exception-0-magento-framework-config-dom-validati...

[pantelisgr · Accepted solution]

It was a modified xml in a module, i tried to load async fonts from xml and i had forgot this modification.... 

It is solved