title: Error inflating class android.support.design.widget.CoordinatorLayout
body: <p>I would like use a FloatingActionButton on my application, I read this : <a href="https://guides.codepath.com/android/Floating-Action-Buttons#google-s-official-support-library">https://guides.codepath.com/android/Floating-Action-Buttons#google-s-official-support-library</a> but when I run the Activity I have this error :</p>
  
  <pre><code>java.lang.RuntimeException: Unable to start activity ComponentInfo{com.xavier_laffargue.podcast/com.xavier_laffargue.podcast.ACT_Test}: android.view.InflateException: Binary XML file line #1: Error inflating class android.support.design.widget.CoordinatorLayout
  </code></pre>
  
  <p><strong>XML File</strong></p>
  
  <pre><code>&lt;android.support.design.widget.CoordinatorLayout
      android:id="@+id/main_content"
      xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto"
      android:layout_width="match_parent"
      android:layout_height="match_parent"&gt;
  
      &lt;ListView
          android:id="@+id/lvToDoList"
          android:layout_width="match_parent"
          android:layout_height="match_parent"&gt;&lt;/ListView&gt;
  
      &lt;android.support.design.widget.FloatingActionButton
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_gravity="bottom|right"
          android:layout_margin="24dp"
          android:src="@drawable/ic_action_refresh"
          app:layout_anchor="@id/lvToDoList"
          app:layout_anchorGravity="bottom|right|end" /&gt;
  
  &lt;/android.support.design.widget.CoordinatorLayout&gt;
  </code></pre>
  
  <p><strong>Graddle</strong></p>
  
  <pre><code>*apply plugin: 'com.android.application'
  
  android {
      compileSdkVersion 21
      buildToolsVersion "21.1.2"
  
      defaultConfig {
          applicationId "com.xavier_laffargue.podcast"
          minSdkVersion 21
          targetSdkVersion 20
          versionCode 1
          versionName "1.0"
      }
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
      }
  }
  
  dependencies {
      compile fileTree(dir: 'libs', include: ['*.jar'])
  
      compile 'com.android.support:appcompat-v7:22.2.0'
      compile 'com.android.support:support-v4:22.2.0'
      compile 'com.android.support:design:22.2.0'
  
      compile 'com.android.support:multidex:1.0.1'
      compile 'com.android.support:support-v13:22.2.0'
      compile 'com.android.support:cardview-v7:21.0.+'
      compile 'com.android.support:recyclerview-v7:21.0.+'
  
  }
  </code></pre>