How to fix this issue in the Sale channel Google

[Usacricut]

I received this notification with Google. I am selling Digital file and POD. Who know this issue, please point me how to fix it.
The issues: 

Missing value [shipping] in [Shopping_ads] [US].

Pending initial review in [Shopping_ads] [US].

Thank you in advance

[EmmanuelFlossie]

First disable automatic shipping settings in your Google Channel App, assuming this is what you are using.

Then in Google Merchant Center set your shipping rates located under the gear icon > shipping settings.