nuke roto problem

#1

hi iam new to compositing and roto. i created roto out line for a footage to extract object and when iam trying to comp with ackground there was nothing in my roto node(in all channels). plz help me

#2

No pic. You cannont link to images on your computer, you’ll either have to attach them to your post or upload on soeme imagehost in order to use the /img-tag.