java.lang.AssertionError at startapp

Question

I was trying to fix in my project, but I could not figure out how. Everything went well during development, but after sharing to store and download it as this error occurred. It makes me mad. Who can help me how to fix this ?. please. thanks so much!

This is my error :

Report on store :

Answer 1

my code on FirstActivity class

public class FirstActivity extends AppCompatActivity implements View.OnClickListener {
    ImageButton btnStart, btnMoreApp;
    private AdView adView;
    private AlertDialog alertDialog;
    StartAppAd startAppAd;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.layout_first);
    adView = (AdView) findViewById(R.id.adView);
    startAppAd = new StartAppAd(this);
    AdRequest adRequest = new AdRequest.Builder().build();
    adView.loadAd(adRequest);

    //ad startApp
    StartAppSDK.init(this, "106697618", "200046203", true);
    /** Create Splash Ad **/
    StartAppAd.showSplash(this, savedInstanceState,
            new SplashConfig()
                    .setTheme(SplashConfig.Theme.GLOOMY)
                    .setLogo(R.drawable.ic_launcher)
                    .setAppName("Photo Frame")
    );

    btnStart = (ImageButton) findViewById(R.id.btn_start);
    btnMoreApp = (ImageButton) findViewById(R.id.btn_more_app);
    btnStart.setOnClickListener(this);
    btnMoreApp.setOnClickListener(this);
    }

}

...

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.1.1'
compile 'com.google.android.gms:play-services-ads:8.4.0'
}