Cannot add to DataBase in Android Studio using SQLiteOpenHelper class

I am having trouble trying to implement an SQLite database in my android studio project. I am trying to add a row of user information including name, password, age, gender, and the level they got to in the previous game.

In my database class, which is an extension of the SQLiteOpenHelper, I have:

 package com.example.android.assignment4;


    import android.content.ContentValues;
    import android.content.Context;
    import android.database.Cursor;
    import android.database.sqlite.SQLiteDatabase;
    import android.database.sqlite.SQLiteOpenHelper;
    import android.provider.SyncStateContract;


    /**
     * Created by cristian on 9/21/2015.
     */

    public class DataBase extends SQLiteOpenHelper {

    private static final int TABLE_VERSION = 3;
    private static final String DATABASE_NAME = "database.db";
    public static final String TABLE_USERS = "users";
    public static final String COLUMN_ID = "_id";
    public static final String COLUMN_USERNAME = "name";
    public static final String COLUMN_USERPASS = "pass";
    public static final String COLUMN_USERAGE = "age";
    public static final String COLUMN_LEVEL = "level";
    public static final String COLUMN_GENDER = "gender";
    private static final String[] columns = {COLUMN_ID, COLUMN_USERNAME, COLUMN_USERPASS, COLUMN_USERAGE, COLUMN_LEVEL, COLUMN_GENDER};

    public DataBase(Context context) {
        super(context, DATABASE_NAME, null, TABLE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        String query = "CREATE TABLE " + TABLE_USERS + "(" +
                COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
                COLUMN_LEVEL + " INTEGER, " +
                COLUMN_USERNAME + " TEXT, " +
                COLUMN_USERPASS + " TEXT, " +
                COLUMN_USERAGE + " TEXT, " +
                COLUMN_GENDER + " TEXT " +
                ");";
        db.execSQL(query);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS " + TABLE_USERS);
        onCreate(db);
    }


    //Add a row of a user instance
    public void addUser(User user)
    {
        ContentValues cv = new ContentValues();
        cv.put(COLUMN_LEVEL, user.getLevel());
        cv.put(COLUMN_USERNAME,user.getName());
        cv.put(COLUMN_USERPASS,user.getPass());
        cv.put(COLUMN_USERAGE,user.getAge());
        cv.put(COLUMN_GENDER, user.getGender());
        SQLiteDatabase db = this.getWritableDatabase();
        db.insert(TABLE_USERS, null, cv);
        db.close();
    }

    public String getRowUserData(int i)
    {   String s ="";
        SQLiteDatabase db = getReadableDatabase();
        String query = "SELECT * FROM " + TABLE_USERS + " WHERE 1" + " ORDER BY " + COLUMN_ID + " DESC";
        Cursor c = db.query(TABLE_USERS, columns, " id = ?", new String[] { String.valueOf(i) }, null, null, null);
        c.moveToFirst();
        s += c.getString(0) + " ";
        s += c.getString(1) + " ";
        s += c.getString(2) + " ";
        s += c.getString(3) + " ";
        s += c.getString(4) + "\n";
        return s;
    }
}

In my activity class I have

    package com.example.android.assignment4;

import android.content.ContentValues;
import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.LinearLayout;
import java.util.*;
import java.io.*;

public class page3 extends AppCompatActivity {

   DataBase db;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_page3);
        db = new DataBase(this);
        Button backButton = (Button) findViewById(R.id.Return);
        backButton.setOnClickListener(backListener);
        LinearLayout l = (LinearLayout) findViewById(R.id.linearLayout);
        //Constuctor with level, name, password, age, and gender
        User user = new User(3, "Test", "pass", "17", "Male");

        db.addUser(user);
        //try to access first entry of Users
        for (int i = 0; i <= 1; i++) {
            String rowData = db.getRowUserData(i);
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_page3, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

Everytime I run the program, it crashes on the line:

Cursor c = db.query(TABLE_USERS, columns, " id = ?", new String[] { String.valueOf(i) }, null, null, null);

in the GetRowUserData function.

So I am assuming that the data is not being added to the database and any attempts to retrieve the data that is not there will return an exception. Anyone know what I am doing wrong?