Remove jackOption from defaultConfig in build.gradle
Add following lines in Application gradle
dependencies {
classpath 'com.android.tools.build:gradle:2.3.1'
classpath 'me.tatarka:gradle-retrolambda:3.2.3'
}
And add following line in build.gradle as below:
apply plugin: 'me.tatarka.retrolambda'
Hope this will help.