ionic executeSql doesn't work

I actually try to make an mobile app with SQLite. I juste try to create two tables:

constructor(private sqlite:SQLite,public modalCtrl: ModalController,public navCtrl:
 NavController, private navParam: NavParams, private databaseprovider: DatabaseProvider,
 private employeesProvider: EmployeeProvider) {
    this.createDetabaseFile();
}

private createDetabaseFile() : void {
    this.sqlite.create({
          name: DATABASE_FILE_NAME,
          location: 'default'
    }).then((dbRes: SQLiteObject) => {
        alert("bdd créée");
        this.db = dbRes;
        this.createTables();
    })
}

private createTables() : void {
    this.db.executeSql('CREATE table IF NOT EXISTS  symbole(id INTEGER NOT NULL ,name 
TEXT)',{})
        .then(() => {
            alert("table symbole created");
            this.db.executeSql('CREATE table IF NOT EXISTS representationPhoto(name 
VARCHAR(32))',{})
                .then(() => {
                    alert("table representationPhoto created");
                })
            .catch(e => alert("erreur creation table"));
        })
        .catch(e => alert("erreur creation table"));
}

And db.executeSql() seem not working, indeed, the alert("table symbole created"); don't appear, however alert("bdd créée") appear, and the program don't triggered the catch.
Have you an idea?
ps: sorry for my bad english


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