Instrumentation with Multidexing

I am trying to run AndroidTest but I got the following error:

    :app:transformClassesWithMultidexlistForDebugAndroidTest
ProGuard, version 5.2.1
Reading program jar [app/build/intermediates/transforms/jarMerging/androidTest/debug/jars/1/1f/combined.jar]
Reading library jar [Library/Android/sdk/build-tools/23.0.3/lib/shrinkedAndroid.jar]
Preparing output jar [app/build/intermediates/multi-dex/androidTest/debug/componentClasses.jar]
  Copying resources from program jar [/app/build/intermediates/transforms/jarMerging/androidTest/debug/jars/1/1f/combined.jar]
:app:transformClassesWithDexForDebugAndroidTest
Error:Error converting bytecode to dex:
Cause: Dex cannot parse version 52 byte code.
This is caused by library dependencies that have been compiled using Java 8 or above.
If you are using the 'java' gradle plugin in a library submodule add 
targetCompatibility = '1.7'
sourceCompatibility = '1.7'
to that submodule's build.gradle file.
Error:1 error; aborting
Error:Execution failed for task ':app:transformClassesWithDexForDebugAndroidTest'.
> com.android.build.api.transform.TransformException: com.android.ide.common.process.ProcessException: java.util.concurrent.ExecutionException: com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command '/Applications/Android http://ift.tt/28UGHAW'' finished with non-zero exit value 1
Information:BUILD FAILED

Some times it runs and sometimes it just show this error or this error:

The APK file /bb/app/build/outputs/apk/app-debug-androidTest-unaligned.apk does not exist on disk. Error while Installing APK

This is my build.gradle:

apply plugin: 'com.android.application'
apply plugin: 'com.neenbedankt.android-apt'
apply plugin: 'realm-android'
android {
    compileSdkVersion 23
    buildToolsVersion "23.0.3"
    defaultConfig {
        applicationId "net.bb"
        minSdkVersion 17
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
        //testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        testInstrumentationRunner "bb.tests.myTestRunner"
        multiDexEnabled = true
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
        debug {
            debuggable true
        }
    }
    dexOptions {
        incremental true
        javaMaxHeapSize "4g"
        preDexLibraries = false
            }
    /*compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
*/
    packagingOptions {
        exclude 'META-INF/services/javax.annotation.processing.Processor'
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/NOTICE'
        exclude 'META-INF/services/javax.annotation.processing.Processor'
    }
}
dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    testCompile 'junit:junit:4.12'
    testCompile 'org.mockito:mockito-core:1.10.19'
    testCompile "org.robolectric:robolectric:3.0"
    testCompile 'org.robolectric:shadows-support-v4:3.0'
    testCompile "org.powermock:powermock-module-junit4:1.6.4"
    testCompile "org.powermock:powermock-module-junit4-rule:1.6.4"
    testCompile "org.powermock:powermock-api-mockito:1.6.4"
    testCompile "org.powermock:powermock-classloading-xstream:1.6.4"
    //support libs
    compile 'com.android.support:appcompat-v7:23.4.0'
    compile 'com.android.support:design:23.4.0'
    compile 'com.android.support:cardview-v7:23.4.0'
    compile 'com.android.support:palette-v7:23.4.0'
    compile 'com.android.support:support-annotations:23.4.0'
    compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha3'
    // MultiDex
    compile 'com.android.support:multidex:1.0.1'
    // Dagger 2
    compile 'com.google.dagger:dagger:2.0'
    apt "com.google.dagger:dagger-compiler:2.0"
    provided 'javax.annotation:jsr250-api:1.0'
    // Injecting views
    compile 'com.jakewharton:butterknife:7.0.1'
    // RX support
    compile 'io.reactivex:rxandroid:1.1.0'
    compile 'io.reactivex:rxjava:1.1.0'
    // Debugging tools
    debugCompile 'com.facebook.stetho:stetho:1.3.1'
    debugCompile 'com.uphyca:stetho_realm:0.9.0'
    androidTestCompile 'com.android.support:support-annotations:23.4.0'
    androidTestCompile 'com.android.support.test:runner:0.5'
    androidTestCompile 'com.android.support.test:rules:0.5'
    androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.2'
    androidTestCompile 'org.hamcrest:hamcrest-library:1.3'
    androidTestCompile('com.android.support:multidex-instrumentation:1.0.1') {
        exclude group: 'com.android.support', module: 'multidex'
    }

}
configurations.all {
    // Currently espresso is dependent on support-annotations:22.2.0
    resolutionStrategy.force 'com.android.support:support-annotations:22.2.1'
}

and this is my runner:

public class MyTestRunner extends AndroidJUnitRunner {
@Override
public void onCreate(Bundle arguments) {
    MultiDex.install(this.getTargetContext());
    super.onCreate(arguments);
}

and this is my test:

 @LargeTest
public class DatabaseRepositoryInstrumentationTest extends InstrumentationTestCase {
    public static final String TAG = DatabaseRepositoryInstrumentationTest.class.getSimpleName();
    DatabaseRepository db;
    Handler handler;
    RealmConfiguration realmConfiguration;

    @Before
    public void setUp() throws Exception {
        Context context = InstrumentationRegistry.getTargetContext();
        db = new DatabaseRepositoryImpl(context);
        assertNotNull(db);
        handler = new Handler(Looper.getMainLooper());
        realmConfiguration = new RealmConfiguration.Builder(context)
                .name("test.realm")
                .build();
        Realm.deleteRealm(realmConfiguration);
        Realm.setDefaultConfiguration(realmConfiguration);
    }

    @Test
    public void saveAndLoadDataMaster() {
        //to avoid java.lang.IllegalStateException: Your Realm is opened from a thread without a Looper. Async queries need a Handler to send results of your query
        handler.post(new Runnable() {
            @Override
            public void run() {
                try {
                    db.saveDataMaster("masterdata.json");
                } catch (IOException e) {
                    fail(e.getMessage());
                    Log.d(TAG, "Error in saving data to Realm!");
                }
                Observable<RealmResults<DataMaster>> dataObservable = db.loadDataMaster();
                dataObservable.subscribe(new Subscriber<RealmResults<DataMaster>>() {
                    @Override
                    public void onCompleted() {
                        db.close();
                    }

                    @Override
                    public void onError(Throwable e) {
                        Log.d(TAG, "Could not load master data!");
                        fail(e.getMessage());
                        db.close();
                    }

                    @Override
                    public void onNext(RealmResults<DataMaster> dataMasters) {
                        DataMaster dataMaster = dataMasters.first();
                        Log.d(TAG, "db version" + dataMaster.getVersion());
                        Log.d(TAG, "call: " + dataMaster.getEquipments().first().getMeasurands().first().getName());
                        Log.d(TAG, "call: " + dataMaster.getEquipments().first().getMeasurands().first().getUiPrimary());
                        Log.d(TAG, "call: " + dataMaster.getEquipments().first().getMeasurands().first().getUiSecondary());

                        Log.d(TAG, "call: " + dataMaster.getEquipments().first().getMeasurands().first().getDecimalPoint());

                        assertThat("13062016-2", is(equalTo(dataMaster.getVersion())));
                    }
                });
            }
        });
    }
}

Any hints or suggestions in what I am doing wrong is totally appreciated.