This is a temporary error received from Meta API, it means API is experiencing temporary issues. This type of error usually goes away automatically within a short period of time.
Meanwhile what you can try refreshing the connection between your Facebook account and the platform using the links below.
1. Log into the relevant Facebook profile
2. Follow the link
If the error persists after completing all the steps above, please reach out to our team via chat or at support@bir.ch.