Problem when creating NavigationView

In an activity, I try to create a side menu. For this I am using the NavigationView object following this tutorial:

User Interface on Android: Navigation Drawer (NavigationView)

The problem I have is that I do not recognize this object, the message that shows me in the Preview is the following:

  

The following classes could not be found:   - android.support.design.widget.NavigationView (Fix Build Path, Create Class)

I've tried adding other libraries but it still gives me an error.

My gradle file is as follows:

apply plugin: 'com.android.application'

android {
compileSdkVersion 21
buildToolsVersion "21.1.2"

defaultConfig {
    applicationId "net.pablo.android.app"
    minSdkVersion 15
    targetSdkVersion 21
    versionCode 20       
    versionName "1.18"   
}
buildTypes {
    debug {
        debuggable true
    }
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}
}

allprojects {
repositories {
    maven { url "https://jitpack.io" }
}
}

dependencies {

compile fileTree(dir: 'libs', include: ['*.jar'])
compile('org.simpleframework:simple-xml:2.7.1') {
    exclude module: 'stax'
    exclude group: 'stax', module: 'stax-api'
    exclude group: 'xpp3', module: 'xpp3'
}
compile 'com.android.support:appcompat-v7:21.0.3'
compile 'com.android.support:support-v4:21.0.3'
compile 'com.google.code.gson:gson:2.3.1'
compile 'com.google.android.gms:play-services-maps:9.4.0'
compile 'com.google.android.gms:play-services-location:9.4.0'
compile 'com.androidplot:androidplot-core:0.9.8'
compile 'com.github.PhilJay:MPAndroidChart:v3.0.0-beta1'
compile 'joda-time:joda-time:2.9.4'
compile 'com.google.maps.android:android-maps-utils:0.4+'
}

Following the comment of @ A.Cedano, I tried to put the file gradle the following line:

compile 'com.android.support:design:21.0.3'

but I still get error, the following:

  

Failed to resolve: com.android.support:design:21.0.3

It gives me the option of Install Repository and sync project but when I press it to install this repository it does not do anything, it does not install anything.