App closes on insert query SQLlite

My app closes when i insert this sample records for testing, i tried it in many ways. from activity class im sending string values to insert to the database.

My Activity Class

if ( mydb.insertsample( "one" , "two" , "3" )){
Toast.makeText(getApplicationContext(), "Insert Success!", Toast.LENGTH_SHORT).show();
}       
else{
Toast.makeText(getApplicationContext(), "not done", Toast.LENGTH_SHORT).show(); 
}

My database SQLiteOpenHelper class

public class DBHelper extends SQLiteOpenHelper {

public static final String DATABASE_NAME = "MyDBName.db";
public static final String TABLE_SAMPLE = "sample";

public DBHelper(Context context)
   {
      super(context, DATABASE_NAME , null, 1);
   }
public void onCreate(SQLiteDatabase db) {

String CREATE_SAMPLE_TABLE = "CREATE TABLE sample ( " +
              "id INTEGER PRIMARY KEY AUTOINCREMENT, " + 
              "one TEXT, "+
              "two TEXT, "+
              "three TEXT )";
      db.execSQL(CREATE_SAMPLE_TABLE);
}

public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
      db.execSQL("DROP TABLE IF EXISTS sample");
      onCreate(db);
   }
public boolean insertsample  (String one, String two, String three)
   {
      SQLiteDatabase db = this.getWritableDatabase();
      ContentValues myValues = new ContentValues();

      myValues.put(one, one);
      myValues.put(two, two);
      myValues.put(three, three);

      db.insert(TABLE_SAMPLE, null, myValues);
      return true;
   }
}