Error Loading Thread when i try to send anything

i just set up suna ai on my local kali machine  but after i signed up and did everything i tried to send a prompt but this error keeps showing

Failed to load thread data: Error: {"detail":"Failed to fetch thread: (psycopg.OperationalError) failed to resolve host 'postgresql': [Errno -2] Name does not resolve\n(Background on this error at: https://sqlalche.me/e/20/e3q8)"}

please help