localai /backend/monitor api return 500:backend xxx.bin is not currently loaded

system api is ok:

![Image](https://github.com/user-attachments/assets/f9f9c9dc-d7c3-4eae-9392-2b747a5b9b4b)

models api is ok:

![Image](https://github.com/user-attachments/assets/94f7c31d-0515-4770-bf1a-c4f4b4b6d93a)

bacnend/monitor api is not ok:

![Image](https://github.com/user-attachments/assets/0c074275-1895-43da-b21f-829442fcef76)