java.lang.IllegalStateException: Could not initialize plugin: MockMaker

Trying to run instrumentation test on AS.

stuck with this Error:

java.lang.IllegalStateException: Could not initialize plugin: interface org.mockito.plugins.MockMaker at org.mockito.internal.configuration.plugins.PluginLoader$1.invoke(PluginLoader.java:66) at java.lang.reflect.Proxy.invoke(Proxy.java:393) at $Proxy4.isTypeMockable(Unknown Source)

ExampleInstrumentedTest.java

      @RunWith(AndroidJUnit4.class)
        public class ExampleInstrumentedTest {
        
            @Mock
            Context context;
     
  @Before
    public void init(){
        MockitoAnnotations.initMocks(this);
    }

        @Test
            public void testDisabledFlag()  {
                ChanceValidator chanceValidator  = new ChanceValidator(context);
                Validator.ValidationResult result = chanceValidator.validate(2);
                assertEquals(result, Validator.ValidationResult.NO_ERROR);
        }
       }

build.gradle

apply plugin: 'com.android.application'

     android{
        ..
        defaultConfig {
                testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        }
        
         testOptions {
                unitTests.returnDefaultValues = true
            }
    }
    
    
    dependencies {
        compile fileTree(include: ['*.jar'], dir: 'libs')
        // Unit testing dependencies
        testCompile 'junit:junit:4.12'
        // Set this dependency if you want to use the Hamcrest matcher library
        testCompile 'org.hamcrest:hamcrest-library:1.3'
        // more stuff, e.g., Mockito
        androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
            exclude group: 'com.android.support', module: 'support-annotations'
        })
        compile 'com.android.support:appcompat-v7:25.1.0'
        compile project(':mortar')
        compile project(':mockito-core-2.6.6')
    }
        

Update: After commenting line-

MockitoAnnotations.initMocks(this);

It is building fine(No Exception) but context mocked is now null.

This Worked in my case:

dependencies { 
def mockito_version = '2.7.1' // For local unit tests on your development machine
 testCompile "org.mockito:mockito-core:$mockito_version" // For instrumentation tests on Android devices and emulators
 androidTestCompile "org.mockito:mockito-android:$mockito_version"
 }

I didn’t comment initMocks