java.lang.IllegalStateException: Trying to create a platform view of unregistered type: plugins.ko2ic.com/google_ad_manager/banner

[play75010]

Hello.

I've tried to add an ad (BANNER or MEDIUM_RECTANGLE) with no success. I get this error message every time. A space is allocated in my app but no ad is displayed. I'm too much of a newbie to flutter/java to understand what the issue is about.

Thanks for any help