Hi there, @abubackar ...
If you are experiencing error messages when trying to import/copy course content, I would suggest that you reach out to Canvas Support to report the issue. That way, they can log a ticket for you, and they can help to look into this further for you. If you click on the "Help" icon on the left-hand global navigation of your school's Canvas environment, you should have some links...one of which might be to "Report a Problem". This is where you can submit a ticket.
How do I get help with Canvas?
Hopefully you'll be able to get in touch with someone soon. Good luck, and keep us posted. Thanks!