I am getting an error while synchronising my gradle file after adding the dependencies for firebase. Here is my build gradle:
apply plugin: 'com.android.application'
android {
compileSdkVersion 27
defaultConfig {
    applicationId "com.practicumproject.practicumproject"
    minSdkVersion 14
    targetSdkVersion 27
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
//noinspection GradleCompatible
implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support.constraint:constraint-layout:1.1.0'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
implementation 'com.google.firebase:firebase-core:9.6.0'
implementation 'com.google.firebase:firebase-auth:9.6.0'
implementation 'com.google.firebase:firebase-database:9.6.0'
implementation 'com.firebase:firebase-client-android:2.3.1'
}
Why am I getting this error? Could anyone help me to resolve this? I am getting error like this:
Unable to resolve dependency for ':app@releaseUnitTest/compileClasspath': Could not resolve com.firebase:firebase-client-android:2.3.1. Open File Show Details
 
    