The ID "{object_id}" doesn't belong to the ad account you're importing into. You can either remove the row from the spreadsheet and try your upload again, or import it into the correct ad account.

Why did this happen?

This error occurs when the ID that you've provided in your spreadsheet represents an ad object from another ad account.

How do I fix it?

When importing a campaign/ad set/ad in Excel, make sure that the IDs represent the ad objects of your ad account only. There should not be IDs for other accounts.

* Nguồn: Facebook