Build.gradle version

Hey there! I have a question regarding the gradle version. When I create a project, in ionic 2 rc-5 or final version, and do all the set up as usual (on mac), I have to change in the ‘project/platforms/android/build.gradle’ the '’
to 2.1.0 .
If not the project will not work. The wrapper gradleVersion is 2.14.1 .
Is anyone have the same trouble? Or is it something to do with the settings in android studio?