class file for org.ros.internal.message.Message not found #311

@Override
public void onStart(final ConnectedNode connectedNode){
    final Publisher<std_msgs.String> pubString =
            connectedNode.newPublisher("table_talk", std_msgs.String._TYPE);

    connectedNode.executeCancellableLoop(new CancellableLoop() {
        @Override
        protected void loop() throws InterruptedException {
            std_msgs.String msg = pubString.newMessage();
            msg.setData("hello");
            pubString.publish(msg);
            Thread.sleep(1000);
        }
    });
}

error: cannot access Message
 msg.setData("Hello");
                   ^
  class file for org.ros.internal.message.Message not found

buildscript {
    repositories {
        google()
        jcenter()
        maven { url 'https://github.com/rosjava/rosjava_mvn_repo/raw/master' }
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.5.3'
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()

        maven { url 'https://github.com/rosjava/rosjava_mvn_repo/raw/master' }
        mavenCentral()

    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.2"
    defaultConfig {
        applicationId "test.android"
        minSdkVersion 15
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'

    implementation 'org.ros.rosjava_core:rosjava:[0.1,0.2)'
    implementation 'org.ros.android_core:android_10:[0.3,0.4)'
    implementation 'org.ros.android_core:android_15:[0.3,0.4)'
    implementation 'org.ros.rosjava_messages:std_msgs:[0.5, 0.6)'
}