title: Proguard Note for unknown class 'Object' with Android Studio and Gradle
body: <p>I've created a new project in Android Studio and am using Gradle to build it.</p>
  
  <p>I've added my Proguard integration for release builds, and I am seeing this Note every time I run my <code>assembleRelease</code> step:</p>
  
  <pre><code>Note: the configuration refers to the unknown class 'Object'
        Maybe you meant the fully qualified name 'java.lang.Object'?
  </code></pre>
  
  <p>None of my Proguard configuration files, or the ones in the Android SDK folder include an unqualified name <code>Object</code>.</p>
  
  <p>My <code>build.gradle</code> includes: </p>
  
  <pre><code>buildTypes {
      release {
          runProguard true
          proguardFile 'proguard-project.txt'
          proguardFile getDefaultProguardFile('proguard-android-optimize.txt')
  
          signingConfig signingConfigs.release
      }
  }
  </code></pre>
  
  <p>I even see the same Note when I remove both the <code>proguardFile</code> lines above, and also if I delete my custom Proguard rules (each time doing a clean before rebuilding).</p>
  
  <p>I'm guessing this is a benign issue with the Proguard plugin for Gradle?</p>