Error: fetch course handles: course key not found

I followed the installation guidance but encounter this error when i run "pku3b a ls" and "pku3b v ls". I'm sure I get my account and password right in the initialization. How shall i fix it?

<img width="718" height="118" alt="Image" src="https://github.com/user-attachments/assets/ec6fee87-b888-43ca-bced-e515ff24eb5c" />