title: Cause: androidx.navigation.safeargs can only be used with an androidx project
body: <p>I am facing issue with navigation component called <code>safeargs</code>.</p>
  
  <p>I have used <code>classpath 'androidx.navigation:navigation-safe-args-gradle-plugin:2.0.0'</code> in build gradle.</p>
  
  <p>While applying plugin <code>androidx.navigation.safeargs.kotlin</code> in <code>app/build.gradle</code>, I am getting following error:</p>
  
  <blockquote>
    <p>Cause: androidx.navigation.safeargs can only be used with an androidx
    project</p>
  </blockquote>
  
  <p><strong>app/build.gradle</strong></p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  apply plugin: 'kotlin-android'
  
  apply plugin: 'kotlin-android-extensions'
  
  apply plugin: 'androidx.navigation.safeargs.kotlin'
  
  android {
      compileSdkVersion 28
      defaultConfig {
          applicationId "com.test.navigationexample"
          minSdkVersion 14
          targetSdkVersion 28
          versionCode 1
          versionName "1.0"
      }
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
          }
      }
  }
  
  dependencies {
      implementation fileTree(dir: 'libs', include: ['*.jar'])
      implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
      implementation 'androidx.appcompat:appcompat:1.1.0-alpha04'
      implementation 'androidx.constraintlayout:constraintlayout:2.0.0-alpha4'
      implementation 'com.google.android.material:material:1.1.0-alpha05'
      implementation 'androidx.navigation:navigation-fragment-ktx:2.0.0'
      implementation 'androidx.navigation:navigation-ui-ktx:2.0.0'
  }
  </code></pre>