net.sqlcipher.database.SQLiteException: no such table: categories: , while compiling: INSERT

i want to encrypt database file in my project.i am using sqlCipher for this work.but when insert values in table get error same this: net.sqlcipher.database.SQLiteException: no such table: categories: , while compiling: INSERT INTO categories(...);

gradle file:

maven {
    url "http://ift.tt/1asOQMt"
}

and

dependencies {
compile'com.commonsware.cwac:sqlcipher-for-android:3.3.1'}

cunstructor of DBHandler:

public DBEncryptedHandler(String dbName) {
    databaseName = dbName;
    _dbHelper = new DatabaseHelper(app.getContextThis(), app.getDatabaseName(), null, app.getDatabaseVersion());

    SQLiteDatabase.loadLibs(app.getContextThis());
    File databaseFile = app.getContextThis().getDatabasePath("db_name");
    databaseFile.mkdirs();
    databaseFile.delete();
    _writableDatabase = SQLiteDatabase.openOrCreateDatabase(databaseFile, DB_PASS, null);
}

please help me):