FAILURE: Build failed with an exception.
- What went wrong:
**A problem occurred configuring project ':app'.
java.lang.NullPointerException (no error message)**
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
Total time: 4.261 secs
Could not install the app on the device, read the error above for details.
Make sure you have an Android emulator running or a device connected and have
set up your Android development environment: