It seems that the one or more pages in the Atlas_UI_resources in your sample project is using the Google Maps widget from the Mendix appstore. You can download this from the Mendix appstore into the project or remove that widget from those pages.
Hope this helps.
Please update source code Sample Projects, all source have errors about GoogleMaps, I’m beginner, I quite confused, I can’t run project . Please update it. Thank you so much !