title: Error:Caused by: groovy.lang.MissingPropertyException: Could not get unknown property 'navigationVersion'
body: <p>I get this error when make two changes
  first, add the following dependency in my build.gradle file</p>
  
  <pre><code>dependencies {
          classpath 'com.android.tools.build:gradle:3.3.0'
          classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$version_kotlin"
          classpath "android.arch.navigation:navigation-safe-args-gradle-plugin:$navigationVersion"
  </code></pre>
  
  <p>Second add the line to my build.gradle(module) file </p>
  
  <pre><code>apply plugin: 'androidx.navigation.safeargs'
  </code></pre>