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Facebook imposes limits on ad accounts, restricting how many campaigns and ads (a.k.a. ad groups) they can contain. If your ad account has reached its limit you will receive an error:
Facebook allows a maximum of 5 000 non-deleted ads and 1 000 non-deleted campaigns for regular ad accounts. For a bulk ad account you can have 10 000 non-deleted campaigns and 50 000 non-deleted ads (ad groups).
In order to publish ads you need to delete campaigns and/or ads from your ad account.
To upgrade to a bulk account you will have to reach out to Facebook directly.