Welcome to our Community!
Please post the screenshot of full error, your’s is not full.
@Domhnall, any comments?
Make sure you are using 512px X 512px .jpg/png image as your app icon also the Size of yor app should not be more then 8MB. Double check the blocks of each screen & make sure it won’t have any errors or warnings before compiling your apk.
Are you using any extensions in your project??