Couldn't Find Method of resvalue for Fire base Argument.(Error Of Fire base Res-value)

    buildscript {
    repositories {
        mavenCentral()
        maven { url 'https://maven.fabric.io/public' }

    }

    dependencies {

        classpath 'io.fabric.tools:gradle:1.+'

        classpath 'me.tatarka:gradle-retrolambda:3.2.5'
        classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'

        classpath 'com.google.gms:google-services:3.0.0'


    }
}
apply plugin: 'com.android.application'
apply plugin: 'me.tatarka.retrolambda'
apply plugin: 'io.fabric'
apply plugin: 'com.neenbedankt.android-apt'


repositories {
    maven { url 'https://maven.fabric.io/public' }
    maven { url "https://oss.sonatype.org/content/repositories/snapshots/" }
    maven { url "http://dl.bintray.com/jjhesk/maven" }

}


android {
    signingConfigs {
        // Comment out below lines to remove key signing
        testReleaseKey {
            keyAlias "testReleaseKey"
            keyPassword "testReleaseKey"
            storeFile file("/home/arka/keystores/arkaTestKeystore.jks")
            storePassword "arkaTestKeystore"
        }
    }
    compileSdkVersion 27
    buildToolsVersion "23.0.2"
    defaultConfig {
        applicationId "com.ahanapharmacy.app"
        minSdkVersion 15
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"


    }

    defaultConfig {
        // Stops the Gradle plugin’s automatic rasterization of vectors
        generatedDensities = []
        vectorDrawables.useSupportLibrary = true

    }
    // Flag to tell aapt to keep the attribute ids around
    aaptOptions {
        additionalParameters "--no-version-vectors"
    }
    buildTypes {

        buildTypes.each {
            it.resValue "string", "firebase_url", FIREBASE_URL
            it.resValue "string", "server_url", SERVER_URL

            it.resValue "string", "twitter_key", TWITTER_KEY
            it.resValue "string", "twitter_secret", TWITTER_SECRET


            it.resValue "string", "cloudinary_url", CLOUDINARY_URL

        }

        debug {
            ext.enableCrashlytics = false
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'

        }
        release {
            // comment out below line to disable signing
            signingConfig signingConfigs.testReleaseKey
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }

    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    testCompile 'junit:junit:4.12'
    compile('com.digits.sdk.android:digits:1.10.3@aar') {
        transitive = true;
    }
    compile('com.crashlytics.sdk.android:crashlytics:+@aar') {
        transitive = true;
    }
    apt 'com.jakewharton:butterknife-compiler:8.0.1'
    retrolambdaConfig 'net.orfjackal.retrolambda:retrolambda:2.3.0'
    compile 'com.squareup.okhttp:okhttp:2.7.5'
    compile 'com.squareup.okhttp:okhttp-urlconnection:2.7.5'
    compile 'com.jakewharton:butterknife:8.0.1'
    compile 'io.reactivex:rxandroid:1.1.0'
    compile 'io.reactivex:rxjava:1.1.3'
    compile 'com.android.support:design:23.4.0'
    compile 'com.mobsandgeeks:android-saripaar:2.0.3'
    compile 'com.android.support:support-v4:23.4.0'
    compile 'com.android.support:recyclerview-v7:23.+'
    compile 'com.android.support:cardview-v7:23.4.0'
    compile 'com.github.jkwiecien:EasyImage:1.2.3'
    compile 'com.github.bumptech.glide:glide:3.7.0'
    compile 'com.cloudinary:cloudinary-android:1.4.2'
    compile 'com.github.chrisbanes:PhotoView:1.2.6'
    compile 'com.jakewharton.timber:timber:4.1.2'
    compile 'com.github.medyo:android-about-page:1.0.8'
    compile 'com.github.paolorotolo:appintro:3.4.0'
    compile 'com.google.firebase:firebase-database:9.0.0'
    compile 'com.google.firebase:firebase-auth:9.0.0'
    compile 'com.android.support:support-annotations:23.4.0'

    compile 'com.google.firebase:firebase-messaging:9.0.0'

    compile 'jp.wasabeef:recyclerview-animators:2.2.3'

    compile 'com.google.firebase:firebase-config:9.0.0'

    compile 'com.google.firebase:firebase-core:9.0.0'



}

apply plugin: 'com.google.gms.google-services'

The error is here so please give me some ideas to solve this error or to get rid of this error. "Could not find method resValue() for arguments [string, firebase_url, BuildType_Decorated{name=FIREBASE_URL, debuggable=false, testCoverageEnabled=false, jniDebuggable=false, pseudoLocalesEnabled=false, renderscriptDebuggable=false, renderscriptOptimLevel=3, versionNameSuffix=null, minifyEnabled=false, zipAlignEnabled=true, signingConfig=null, embedMicroApp=true, mBuildConfigFields={}, mResValues={}, mProguardFiles=[], mConsumerProguardFiles=[], mManifestPlaceholders={}}] on BuildType_Decorated{name=debug, debuggable=true, testCoverageEnabled=false, jniDebuggable=false, pseudoLocalesEnabled=false, renderscriptDebuggable=false, renderscriptOptimLevel=3, versionNameSuffix=null, minifyEnabled=false, zipAlignEnabled=true, signingConfig=SigningConfig_Decorated{name=debug, storeFile=C:\Users\Ali Raza.android\debug.keystore, storePassword=android, keyAlias=AndroidDebugKey, keyPassword=android, storeType=C:\Users\Ali Raza.android\debug.keystore}, embedMicroApp=false, mBuildConfigFields={}, mResValues={}, mProguardFiles=[], mConsumerProguardFiles=[], mManifestPlaceholders={}}."

it.resValue "string", "firebase_url", FIREBASE_URL