I would doubt it very much, that it was 'just' human error, although it is possible.
IF everything was working fine on the flightdeck, then there is little reason for disorientation and loss of situational awareness. Have they really checked and ruled out all other possibilities in such a short time? What about a failed horizon or the like?
Never flown a 37, but as there are thousands around and they donīt fall out of the skies like appels in autumn, there might very well be more to it than just the easy way out, pilot error.