Android - transform Classes With Dex For Debug

you can selectively compile Google Play service APIs into your app. For example, to include only the Google Fit and Android Wear APIs, replace the following line in your build.gradle file:

 compile 'com.google.android.gms:play-services:8.4.0'

with these lines:

compile 'com.google.android.gms:play-services-fitness:8.4.0'
compile 'com.google.android.gms:play-services-wearable:8.4.0'

==> to keep the number of methods in your app (including framework APIs, library methods, and your own code) under the 65,536 limit.

Adding the following code to build.gradle app module solved my problem

android{
    defaultConfig {

        // Enabling multidex support.
        multiDexEnabled true
    }


    dexOptions {
        javaMaxHeapSize "4g"
    }
}
dependencies {
    //...
    compile 'com.android.support:multidex:1.0.0'
}