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build.gradle modify the project file

In jcenter () before adding mavenCentral ()

 1 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 2 
 3 buildscript {
 4     repositories {
 5         mavenCentral();
 6         jcenter()
 7     }
 8     dependencies {
 9 //        classpath 'com.android.tools.build:gradle:2.0.0-alpha3'
10         classpath 'com.android.tools.build:gradle:3.4.0'
11 
12         // NOTE: Do not place your application dependencies here; they belong
13         // in the individual module build.gradle files
14     }
15 }
16 
17 allprojects {
18     repositories {
19         mavenCentral()
20         jcenter()
21     }
22 }
23 
24 task clean(type: Delete) {
25     delete rootProject.buildDir
26 }