Error: cannot find symbol method initApplication(Configuration)

[kshitijdeota]

I am trying to customise Dashboard using this wiki:
https://github.com/danimahardhika/candybar-library/wiki/Dashboard-Configuration
Where is the method declared in the library, I can't seem to find it 🧐

Gradle 3.0.0
Library: 3.5.0-b4

error: CandyBar is not abstract and does not override abstract method onInit() in ApplicationCallback
error: cannot find symbol method initApplication(Configuration)

I'm novice on Java / Android Studio 🤦‍♂️