Airtable integration error: specify link to records

I am quite new to bubble and encounter the following error:

I created an app that shows information in Bubble when updating Airtable. I might have made a few updates in Airtable and now receiving the following failure message:

“You won’t be able to save your schema until fields of type “Link to records” have their table type specified.”

Does anyone have an idea what this means?

Thank you!