Hey Wilkinsbud,
After reviewing your , it looks as though your compiler isn’t up to date:
[javac] warning: com\\android\gms\ads\AdView.class(com\\android\gms\ads:AdView.class): major version 51 is newer than 50, the highest major version supported by this compiler.
Once you’ve done that, please delete your Intermediate, Saved and Cofig files from your project folder while the project is closed. Make sure you delete your Android/src folder out of your Builds folder too.
Once you’ve done that, please reply back and let me know how your project is reacting, upload the new if you’re still running into any errors.