Date: 2017apr16 OS: Android Keywords: Android Studio Q. Why isn't my project finding the classes that are supposed to be in my local .aar A. When this happened to me once the problem was that there was no "classes.jar" in the root folder of the .aar. To check you can rename the mylib.aar to mylib.aar.zip and look inside. If there classes.jar is missing is this a big help to narrowing down the problem. Because you know the .aar is to blame, not your using project's gradle scripts.