Due to Facebooks force re-login that took place on 28'th of September 2018 because of a security breach (read more from here: https://www.bbc.com/news/technology-45686890), you'll need to log out and log back in from your Facebook account(s) in Facebook Ads and Facebook Insights connectors.
For more details on how to do this:
Google Sheets: How do I Re-Authenticate a Google Sheets Connector?
Data Studio: How do I Re-Authenticate a Data Studio Connector?
If this doesn't help:
Go through these steps to remove Supermetrics connection from your Facebook: Facebook Insights Error: (#283) Requires manage_pages permission to manage the object (starting from "What if that didn't work") , then start the authentication process again for your Facebook connector.