Error encountered when importing data to Sanity using API

Hi people, I am using this article (https://www.sanity.io/guides/guide-importing-data-from-external-sources ) as a reference when importing data to Sanity. But I get an error that _key is missing. Is there an updated article somewhere on how to import data with array references via the API?

After adding

_key

to the object, I was presented with a new issue. So an updated article on how to import data via the API would be much appreciated :)

Figured it out, trying to add array of objects as reference is not helpful.