@AutoValue does not work on Intellij 2016.1.3

Question

I tried to use Google @AutoValue. But, it does not work on my Intellij.

Step .1 I chose this class

import com.google.auto.value.AutoValue;

@AutoValue
public abstract class Example {
  public static Example create(String name, int integer) {
    return new AutoValue_Example(name, integer);
  }

  public abstract String name();
  public abstract int integer();
}

then

Step 2 printed this code in the build.gradle file

dependencies {
    testCompile group: 'junit', name: 'junit', version: '4.11'
    compile group: 'com.google.auto.value', name: 'auto-value', version: '1.2'
}

Step 3. I had the AutoValue plugin installed.

but Java complier gives me this error:

Error:(12, 20) java: cannot find symbol
  symbol:   class AutoValue_Animal
  location: class Animal