trying to requery an already closed cursor android.database.sqlite.SQLiteCursor@b56f2d6

I need help! I downloaded the open souce project git hub http://ift.tt/24Rg7Bg. It is a project that creates notes. when I add a note or I click the back button the app crashes and gives me the following error trying to requery an Already closed cursor android.database.sqlite.SQLiteCursor@b56f2d6 what can I do? thanks to all `` that will help me!

createnote

public class CreateNote extends Activity {


private static final String TAG = "notepad";

private Button addNoteToDB;
private EditText titleEditText;
private EditText contentEditText;

//this variable will inform us if user want to create a new note or just update
private boolean isEdit;

private DBHelper dbhelper;
private SQLiteDatabase db;

//variable will contain the title of editing note
private String editTitle;
private int id = 0;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.createlayout);

    //binding views from layout to variable
    //quite simple, huh ? :)
    addNoteToDB = (Button) findViewById(R.id.addNoteToDB);
    titleEditText = (EditText) findViewById(R.id.TitleEditText);
    contentEditText = (EditText) findViewById(R.id.ContentEditText);

    //initialization of DBHelper
    //again :)
    //it takes context as argument
    dbhelper = new DBHelper(getApplicationContext());

    //getting the intent
    Intent mIntent = getIntent();
    //if user is editting the note we bind the title of this note to editTitle variable
    editTitle = mIntent.getStringExtra("title");
    id = mIntent.getIntExtra("id", 0);

    //we're getting the isEdit value
    //if user is editing note, the value if true
    //otherwise the default value is false
    isEdit = mIntent.getBooleanExtra("isEdit", false);

    //we're checking if user want to edit note
    if(isEdit) {
        Log.d(TAG, "isEdit");
        //getting the readable database
        db = dbhelper.getReadableDatabase();
        Cursor c = dbhelper.getNote(db, id);
        //closing db connection
        db.close();
        //here we're set title and content of note to editText views
        titleEditText.setText(c.getString(0));
        contentEditText.setText(c.getString(1));
        //and we're changing the button text to something more appropriate
        //from add note to update note 
        //you can change button text in /res/values/strings.xml file
        addNoteToDB.setText(getResources().getString(R.string.updateNoteButton));
    }


    //setting listener for button
    addNoteToDB.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            //when user clicks button 
            //we're grabbing the title and content from editText
            String title = titleEditText.getText().toString();
            String content = contentEditText.getText().toString();

            //if user left title or content field empty
            //we show the toast, and tell to user to fill the fields

            if (title.equals("") || content.equals("")) {
                Toast.makeText(getApplicationContext(), getResources().getString(R.string.validation), Toast.LENGTH_LONG).show();
                return;
            }

            //adding note to db
            if (!isEdit) {
                //if it isn't edit mode we just add a new note to db
                dbhelper = new DBHelper(getApplicationContext());
                dbhelper.addNote(title, content);
                //and finish the activity here
                //so we came back to Simple_NotepadActivity
                finish();
            } else {
                //if this is edit mode, we just update the old note
                dbhelper.updateNote(title, content, editTitle);
                //and the same finish activity
                finish();
            }
        }
    });
}

@Override
protected void onPause() {
    super.onPause();
    dbhelper.close();
}

onenote

public class OneNote extends Activity {

private static final String TAG = "notepad";

//our views for display note title and content
private TextView noteTitle;
private TextView createdAt;
private TextView noteContent;

//dbhelper
private DBHelper dbhelper;
private SQLiteDatabase db;

//default values for title and content variables
private String title = "defaultTitle";
private int id = 0;
private String content = "defaultContent";
private String date = "date";


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.onenote);

    //initialization of DBHelper
    dbhelper = new DBHelper(getApplicationContext());


    noteTitle = (TextView) findViewById(R.id.noteTitle);
    noteContent = (TextView) findViewById(R.id.noteContent);
    createdAt = (TextView) findViewById(R.id.createdAt);

    // getting intent
    Intent mIntent = getIntent();

    id = mIntent.getIntExtra("id", 0);


    //getting the readable database
    db = dbhelper.getReadableDatabase();

    //getting the note from database
    Cursor c = dbhelper.getNote(db, id);
    //closing the database connection
    db.close();

    //getting the content from cursor
    //getString(1) because first column is noteTitle and second is noteContent and the third column is date
    title = c.getString(0).toString();
    content = c.getString(1).toString();
    date = c.getString(2).toString();

    //setting notes to our views
    noteTitle.setText(title);
    noteContent.setText(content);
    createdAt.setText(date);
}