Looks like an UP transfer to the host so it must be related somehow to data your target returned to the host.

Is it possible you are misrepresenting the current load requirements for you device in a manner that is incompatible with the host computer port? I.E. Your device represents a full power load and needs to be behing a powered hub port but that the particular port you are using on the computer is not a full powered root hub device?

You could run a simple test to see if my idea is on track here by placing your device behind one of the non-powered type hubs and then see if you get a similar error.

- Michael Karas