So, I prepared my ads and when I tried to publish it saids this. This Ad set has 1 error- No promotion object found: please specify a promoted object for the ad set

 

Buyer ;  Do you Know Facebook Ads?
I'm      ;  Yes, Of course. I have been officially trained on this.
Buyer ;  So, I prepared my ads and when I tried to publish it                       saids this.

So, I give you exate soluition.