title: java.lang.IncompatibleClassChangeError caused by ActivityTestRule instantiation
body: <p>I added an espresso test to my Android project and got an IncompatibleClassChangeError on the line that is creating an ActivityTestRule. How do I find out what caused it?</p>
  
  <p>Here is the line of code that has caused the error: (HomePageScreenTest.java:27)</p>
  
  <pre><code>@Rule
  public ActivityTestRule&lt;HomePageActivity&gt; homePageActivityTestRule = new ActivityTestRule&lt;&gt;(HomePageActivity.class);
  </code></pre>
  
  <p>Here is the error:</p>
  
  <pre><code>java.lang.IncompatibleClassChangeError: com.example.rocklee.mehmvp.HomePage.HomePageActivity
  at dalvik.system.DexFile.defineClassNative(Native Method)
  at dalvik.system.DexFile.defineClass(DexFile.java:226)
  at dalvik.system.DexFile.loadClassBinaryName(DexFile.java:219)
  at dalvik.system.DexPathList.findClass(DexPathList.java:321)
  at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:54)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
  at com.example.rocklee.mehmvp.HomePage.HomePageScreenTest.&lt;init&gt;(HomePageScreenTest.java:27)
  at java.lang.reflect.Constructor.newInstance(Native Method)
  at java.lang.reflect.Constructor.newInstance(Constructor.java:288)
  at org.junit.runners.BlockJUnit4ClassRunner.createTest(BlockJUnit4ClassRunner.java:217)
  at org.junit.runners.BlockJUnit4ClassRunner$1.runReflectiveCall(BlockJUnit4ClassRunner.java:266)
  at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
  at org.junit.runners.BlockJUnit4ClassRunner.methodBlock(BlockJUnit4ClassRunner.java:263)
  at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
  at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
  at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
  at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
  at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
  at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
  at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
  at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
  at org.junit.runners.Suite.runChild(Suite.java:128)
  at org.junit.runners.Suite.runChild(Suite.java:27)
  at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
  at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
  at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
  at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
  at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
  at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
  at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
  at org.junit.runner.JUnitCore.run(JUnitCore.java:115)
  at android.support.test.internal.runner.TestExecutor.execute(TestExecutor.java:54)
  at android.support.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:240)
  at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1853)
  </code></pre>