BrainChulo: Error - Both in Docker and while running Main.py

I can start the app via docker method. But while uploading/conversation etc. giving errors

backend_1   | INFO:     172.18.0.1:41944 - "OPTIONS /conversations HTTP/1.1" 400 Bad Request
backend_1   | INFO:     172.18.0.1:33130 - "POST /conversations/null/files HTTP/1.1" 422 Unprocessable Entity
backend_1   | INFO:     172.18.0.1:44614 - "OPTIONS /conversations/null/messages HTTP/1.1" 400 Bad Request

So, docker method is not working. However, I can see the frontend GUI.

The only change I did in docker-compose.yaml is to comment the #network_mode: “host” because I was getting this error -

ERROR: for brainchulo_backend_1 "host" network_mode is incompatible with port_bindings

However, I actually want to use the python main.py variation to give me flexibility. When I run the script, i can see port 7865 is running and I can see the webpage. However, when I try to run localhost:5173, I am not getting any interface. How do I run using only main.py?