filter won't display

<img width="1440" alt="Image" src="https://github.com/user-attachments/assets/9a1a8542-3816-412d-8bd6-12a590cf384e" />

so i am pretty new to this and when i was rewriting the codes to include my own data, the filter won't show up and it keeps telling me that "Cannot sort with less than two characters". is there any way to solve the issue?