The thread points to more than one item in the previous node (as it’s unclear which one to use)
To solve these errors, you can either avoid using .item, or fix the root cause.
You can avoid .item by using .first(), .last() or .all()[index] instead. They require you to know the position of the item that you’re targeting within the target node’s output items. Refer to Built in methods and variables | Output of other nodes for more detail on these methods.