android - ERROR: Cannot get property 'compileSdkVersion' on extra properties extension as it does not exist -

i using specialcyci/androidresidemenu third party library (github) in android project. have imported residemenu project workspace , made module dependency library project.

while build project got following error:

error:(7) problem occurred evaluating project ':residemenu'. cannot property 'compilesdkversion' on properties extension not exist   

if explain more can better problem in gradle. need have extension file top-level gradle. let me explain how works:

in app-level gradle file, there should configuration that:

def config = rootproject.extensions.getbyname("ext") 

you can use configurations extension file that:

android {    compilesdkversion config.getat("compilesdkversion")  } 

but, need add extension file root of project:

dependency-versions.gradle

ext { compilesdkversion = 25 //... } 

and need top-level gradle that:

def config = rootproject.extensions.getbyname("ext")