looking in a sqlite database at the click of a button with android

I have a sql database and I want a button to perform a search in the database when the user clicks on it. At the moment, I use the onclick method which I want to execute the function request() defined in the following way

public void request(){
    SQLiteDatabase db = mDbHelper.getReadableDatabase();
    String[] projection = {
            FeedReaderContract.FeedEntry._ID,
            FeedReaderContract.FeedEntry.COLUMN_NAME_TITLE,
            FeedReaderContract.FeedEntry.COLUMN_NAME_UPDATED,
    };

    String sortOrder =
            FeedReaderContract.FeedEntry.COLUMN_NAME_UPDATED + " DESC";

    Cursor c = db.query(
            FeedReaderContract.FeedEntry.TABLE_NAME,  // The table to query
            projection,                               // The columns to return
            null,                                // The columns for the WHERE clause
            null,                            // The values for the WHERE clause
            null,                                     // don't group the rows
            null,                                    // don't filter by row groups
           sortOrder                                 // The sort order
    );
}

Here is the scheme of the database

public final class FeedReaderContract {

public FeedReaderContract() {
}

/* Inner class that defines the table contents */
public static abstract class FeedEntry implements BaseColumns {
    public static final String TABLE_NAME = "entry";
    public static final String COLUMN_NAME_ENTRY_ID = "entryid";
    public static final String COLUMN_NAME_TITLE = " title";
    public static final String COLUMN_NAME_UPDATED = " updatedtitle";
}}

However, when I click the application crashes. Where is the problem?