Sending messages does not work.

Sending messages does not work. I am sending them in the following way and they do not arrive

from whatsapp import Client

@app.route("/sendLocalMessage")
def sendLocalMessage():
        message = request.args.get('message')
        client = Client(login='573017845847', password='MyPassword')
        print message
        client.send_message("573187987898","hola")

Any help, please!
        