Camera not appearing in Characterizer

I am using Character Animator  version 3.3.1.   for the first time. My webcam which I amusing as a camera appears when working in a project fine. If I try using Characterizer to create a character the camera never appears and I can't continue the process.I have clicked the camera tab and my webcam is checked but I see a waiting for camera and the Start Capture button is greyed out.