SQL Expressions: Error "input data must be a wide series but got type not"

<img width="400" height="1377" alt="Image" src="https://github.com/user-attachments/assets/01b07d16-5b3c-494b-ad46-fb39f9ffa19a" /> <img width="408" height="526" alt="Image" src="https://github.com/user-attachments/assets/3a5ef733-d3b2-47b2-987b-92383c3105a1" /> See the images. We get an error, when we shouldn't get an error, IMO