This error message is only visible to WordPress admins
Unsupported get request. Object with ID '17841411194757016' does not exist, cannot be loaded due to missing permissions, or does not support this operation. Please read the Graph API documentation at https://developers.facebook.com/docs/graph-api

Error: Access Token for toscana_componenti_energetici is not valid or has expired. Feed will not update.

There's an issue with the Instagram Access Token that you are using. Please obtain a new Access Token on the plugin's Settings page.