Your interviewer is looking to hear that you are cognizant of any aspects of the job where you would need to work harder to come up to speed to be fully competent. Given the fact that the Distance Learning Specialist field is new, your interviewer isn't expecting to hire someone that can come in and have every aspect of the job mastered. Prior to your interviewer, be sure to read the job description thoroughly and be honest with yourself about the largest potential hurdles. As you answer, do your best to turn this initial weakness that you have into a growth opportunity. Show that you are willing to put in the time and effort to become fully capable in this role.