I continuously receive this error(subject is too dark; cannot adjust exposure. use the flash) and (lighting is poor; flash recommended) throughout the day an every single time at night. I even bring the issue forward to my professor and he don't understand why this error comes up. Do you think my D5100 is malfunction? Is there a way I can stop this from happening? I called Nikon directly an there feed back make no sense at all. It seems like this camera can't be used at night without the error popping up recommending the use of flash. Appreciate the feedback sincerely.