Hello, there could be a number of things that are wrong, but based on the 404 in the SDK logs, my guess is it is trying to access an entrypoint that isn't there for some reason. I would recommend making a case on https://q2developer.com/support/create?ticketType=Bug with as many details you can give and we will get you working from there. It is quite likely that a quick call with a developer will solve this.
The information I am missing is whether you are working local or on the shared dev, what your repo looks like and what commands leading up to q2 run have you run that this is the result.