The bot server is under heavy load and cannot process your request at this time. Please try again

I've tried to set up metabot but getting this error. "The bot server is under heavy load and cannot process your request at this time. Please try again." I've setup the system locally, and the data is in a Postgres db. Normal SQL query works, but the natural language query isn't working.

Any fixes?

Go to a model and ask questions to Metabot based on a model

I'm having the same issue. I can confirm I created a model from the sample data set and am asking a question to metabot from the model. Any idea how to resolve this issue?

Metabot is in alpha stage, so you might get errors on big payloads

Does it ever work? I have a simple model with 3000 rows. Just a list of people. I ask a question about how many have a birthday in June. Receive the error about heavy load.
In the log:

WARN metabase.metabot.client Exception when calling invoke-metabot: Interceptor Exception: status: 404

Suggests it can't find something.