android - Gradle build unable to compile when trying to add ads -


this question has answer here:

ok trying add ads application , tells me add line of code in build.gradle file.

error image:

error image

compile 'com.google.android.gms:play-services:11.2.0'

as can see in image @ bottom says 

  failed resolve:compile 'com.google.android.gms:play-services:11.2.0'

i cannot click install repository , sync project because when nothing. not open windows or anything?

try adding 

maven { url 'https://maven.google.com' }

to project level gradle file


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