adding Gforms to marketo feed

Hi,

I am trying to add a form.
I have installed everything correctly and all I have to do now is assign a gravity form to the marketo feed. when I click on the add button I get this image: Campaign is Required, you can see it here:

https://developers.marketo.com/documentation/soap/requestcampaign/

Can you please assist? Is it something that needs to be configured on the marketo side?

Thanks in advance

https://www.ads-software.com/plugins/marketo/