Hi guys, I am getting the same error, what is confusing for me is this, I had worked on my project using only Java without Maven, I am using Google Drive API, so it was working well, but I wanted to make a refactoring to the project using Maven and Angular, so locally I can get my project working ok with this refactoring, but then I deployed to App Engine and I can not list my drive files through my app, I got the exception mentioned above, but the past versions don't have that problem in App Engine, is confusing for me that now I am getting this ApiProxy$FeatureNotEnabledException, please if somebody has idea what can I do I would thank you so much.