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java.lang.IncompatibleClassChangeError: testPackage.MainFreeActivity	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 libcore.reflect.InternalNames.getClass(InternalNames.java:53)	at java.lang.Class.getDexCacheType(Class.java:479)	at java.lang.reflect.ArtMethod.getDexCacheType(ArtMethod.java:191)	at java.lang.reflect.ArtMethod.getReturnType(ArtMethod.java:145)	at java.lang.reflect.Method.getReturnType(Method.java:184)	at java.lang.Class.getDeclaredMethods(Class.java:771)	at org.junit.internal.MethodSorter.getDeclaredMethods(MethodSorter.java:54)	at org.junit.runners.model.TestClass.scanAnnotatedMembers(TestClass.java:65)	at org.junit.runners.model.TestClass.(TestClass.java:57)	at org.junit.runners.ParentRunner.createTestClass(ParentRunner.java:88)	at org.junit.runners.ParentRunner.(ParentRunner.java:83)	at org.junit.runners.BlockJUnit4ClassRunner.(BlockJUnit4ClassRunner.java:65)	at android.support.test.internal.runner.junit4.AndroidJUnit4ClassRunner.(AndroidJUnit4ClassRunner.java:37)	at android.support.test.runner.AndroidJUnit4.(AndroidJUnit4.java:36)	at java.lang.reflect.Constructor.newInstance(Native Method)	at java.lang.reflect.Constructor.newInstance(Constructor.java:288)	at android.support.test.internal.runner.junit4.AndroidAnnotatedBuilder.buildAndroidRunner(AndroidAnnotatedBuilder.java:83)	at android.support.test.internal.runner.junit4.AndroidAnnotatedBuilder.runnerForClass(AndroidAnnotatedBuilder.java:62)	at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)	at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:26)	at org.junit.runner.Computer.getRunner(Computer.java:40)	at org.junit.runner.Computer$1.runnerForClass(Computer.java:31)	at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:59)	at org.junit.runners.model.RunnerBuilder.runners(RunnerBuilder.java:101)	at org.junit.runners.model.RunnerBuilder.runners(RunnerBuilder.java:87)	at org.junit.runners.Suite.(Suite.java:81)	at org.junit.runner.Computer.getSuite(Computer.java:28)	at android.support.test.internal.runner.TestRequestBuilder.classes(TestRequestBuilder.java:789)	at android.support.test.internal.runner.TestRequestBuilder.build(TestRequestBuilder.java:753)	at android.support.test.runner.AndroidJUnitRunner.buildRequest(AndroidJUnitRunner.java:354)	at android.support.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:260)	at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1853)