Decoding Firebase session cookie failed

I keep Getting this error in the emulator when I try to access via 127.0.0.1:5000. Also if I deploy to the server, I get timeout and couldnt access the website successfully

Unhandled Runtime Error
Error: Decoding Firebase session cookie failed. Make sure you passed the entire string JWT which represents a session cookie. See https://firebase.google.com/docs/auth/admin/manage-cookies for details on how to retrieve a session cookie.