Can anyone tell me why I am receiving this error? I have downloaded a series of projects from GitHub for a Udacity course. Since there are about 50 or 60 projects (Exercises and Solutions) in the repo, I presume it has to do with the fact that each is an individual project on its own. I do not have a problem usually when I fork a repo and clone it locally. 

I have read other posts about uninstalling and reinstalling ndk in the sdk. But I really want to know why this is happening and how I can fix without blindly uninstalling and re-installing. 
 Any help is appreciated. Thanks.