Fusion page works well, but 'Media Offline' in Edit Page

Dear all.
Basic quenstion, i have tried create a Fireworks in fusion page. it works well. But when i switch to edit page, it displays 'Media Offline'.
Did i miss something? thanks.

Fireworks Fusion.jpg (255.51 KiB) Viewed 539 times

Fireworks in fusion page works well

Media Offline in Edit Page.jpg (370.05 KiB) Viewed 539 times

Switch to edit page displays 'media offline'

Fusion compositions can't have a MediaIn since there is no media attached to them.
Connect the renderer3D directly to MediaOut1 or merge it with a transparent background node.

Thanks so much panos, deleting mediaIn solved my problem.