project gradle
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.0-alpha3'
        classpath 'com.google.gms:google-services:3.0.0'
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}
allprojects {
    repositories {
        jcenter()
    }
}
task clean(type: Delete) {
    delete rootProject.buildDir
}
App Gradle
apply plugin: 'com.android.application'
android {
    compileSdkVersion 25
    buildToolsVersion "25.0.2"
    defaultConfig {
        applicationId "com.example.arun4fms.efix"
        minSdkVersion 17
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
        packagingOptions {
            exclude 'META-INF/LICENSE'
            exclude 'META-INF/LICENSE-FIREBASE.txt'
            exclude 'META-INF/NOTICE'
        }
    }
}
dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.google.firebase:firebase-database:10.2.0'
    compile 'com.google.firebase:firebase-crash:10.2.0'
    compile 'com.google.firebase:firebase-auth:10.2.0'
    compile 'com.chabbal:slidingdotsplash:1.0.2'
    compile 'com.google.firebase:firebase-core:10.2.0'
    compile 'com.firebase:firebase-client-android:2.5.2'
    compile 'com.android.support:appcompat-v7:25.2.0'
    compile 'com.android.support:design:25.2.0'
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    testCompile 'junit:junit:4.12'
}
apply plugin: 'com.google.gms.google-services'
Error:A problem occurred configuring root project 'webapp'.
Could not resolve all dependencies for configuration ':classpath'. Could not find com.android.tools.build:gradle:3.0.0-alpha3. Searched in the following locations: file:/C:/Program Files/Android/Android Studio/gradle/m2repository/com/android/tools/build/gradle/3.0.0-alpha3/gradle-3.0.0-alpha3.pom file:/C:/Program Files/Android/Android Studio/gradle/m2repository/com/android/tools/build/gradle/3.0.0-alpha3/gradle-3.0.0-alpha3.jar https://jcenter.bintray.com/com/android/tools/build/gradle/3.0.0-alpha3/gradle-3.0.0-alpha3.pom https://jcenter.bintray.com/com/android/tools/build/gradle/3.0.0-alpha3/gradle-3.0.0-alpha3.jar Required by: project :
 
     
     
     
     
     
    