پروزه sqlite آموزش استاد کار نمیکنه لطفا کمک کنید

به کلاس G ایراد میگیره ب خط آخر

package project.main;

import android.app.Application;
import android.database.sqlite.SQLiteDatabase;
import android.os.Environment;

import java.io.File;

import project.helper.MyDatabaseHelper;


public class G extends Application {
  public static G app;

  public static SQLiteDatabase database;
  public static final String SDCARD = Environment.getExternalStorageDirectory().getAbsolutePath();
  public static final String BRAND_DIR = SDCARD + "/uncox-learn";
  public static final String APP_DIR = BRAND_DIR + "/sample_database";
  public static final String DB_DIR = APP_DIR + "/db";

  @Override
  public void onCreate() {
    super.onCreate();

    app = this;
  }

  public void createAppDirectories() {
    File dbDir = new File(DB_DIR);

    if (!dbDir.exists()) {
      boolean wasCreated = dbDir.mkdirs();
    }

    createOrOpenDatabase();
  }

  public void createOrOpenDatabase() {
    if (database != null) {
      return;
    }

    MyDatabaseHelper dbHelper = new MyDatabaseHelper(this);
    database = dbHelper.getWritableDatabase();
  }
}