Problem In Thunkable As AdSize AdUnit

I Build App But I Am Checking It Live But It say Note Ad size And Ad Unit Be Placed Called
Like That Error And When I Installed It Again Show Why ?

Are you a #thunkable-cross user @Dr_Health?

I’ve moved this from the #creator-lounge to get started.

If you have screenshots of any error messages or error codes can you post them here for the community to take a look at?