Failed to resolve: play-services-tasks

Add in your app.gradle

allprojects {
    repositories {
        jcenter()
        maven {
            url "https://maven.google.com"
        }
    }
}

and upgrade your dependencies version.

In gradle (project), just change the position of google() before jcenter(), and the error is gone.

repositories {
    google()
    jcenter()
}

jcenter() sometimes act as a mirror repository for some Google dependencies. During Gradle building process, it looks for dependencies in the first entry listed in your repositories {...} block. So if this repository is broken or something bad occurs with any dependency the process will fail.

Here there is a recommended order for repository list

    repositories {
        google()
        maven {
            url 'https://maven.google.com/'
        }
        jcenter()
    }

Put google() repository at the very first line of dependencies. It will work.