Enhancement proposal to the user experience

While trying to use the project from a non-technical user perspective I came across this:
I think if the project is going to be used by anyone who wants to use it, maybe a better way to tell if something went wrong would be via error codes or simple error message like: "Failed to load/download the model, Check your internet connection"

There's also the URL format:
What do you think about a URL in this format "chatty.com/c/[id_of_the_conversation]" ? I think it's more intuitive this way since we kind of entering a sub-section of the app.
Suggestion: We can replace the "c" by a "d" to say directory or discussion or even "p" for prompt