My unity banner ad is not showing

Hi Kodular Community! I used unity banner ads in my app but this banner ad is not showing and when i check the error message it says ‘this placement have no ads to fill’. What can I do now?

Please give more details about your app - what does it do, what is it’s purpose etc.

Basically my app is a educational app which gives education videos for every class like 4th to 8th and tricks videos like maths tricks, english tricks and also monthly test etc… Please help me to solve my problem