error while changing the image of duplicate comp

Hi Kashif4748,

Thanks for writing in.

Unfortunately, there is no feature to duplicate and replace the child comps automatically. Instead of doing it manually, you can use this script that does it for you. Also, I'd recommend adding your vote to the feature request: https://adobe-video.uservoice.com/forums/911311-after-effects/suggestions/34070554-duplicate-comps-that-creates-duplicates-of-interna

Feel free to reach out if there are any other questions.

Thanks,

Nishu