Error while setting up SMS

Hello,
I am trying to set-up sms from msg91.com. The sms hppt api they provided is:

https://control.msg91.com/api/sendhttp.php?authkey=106thisisauthkey001234&mobiles=919876543210&message=test message is best&sender=SAREEN&route=4

The settings i saved is: click here for the screenshot

The official API webpage for msg91.com. LINK .

I am getting an error while sending the sms.

Traceback (innermost last):
  File "/home/frappe/frappe-bench/apps/frappe/frappe/app.py", line 57, in application
    response = frappe.handler.handle()
  File "/home/frappe/frappe-bench/apps/frappe/frappe/handler.py", line 19, in handle
    execute_cmd(cmd)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/handler.py", line 36, in execute_cmd
    ret = frappe.call(method, **frappe.form_dict)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/__init__.py", line 806, in call
    return fn(*args, **newargs)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/handler.py", line 67, in runserverobj
    frappe.desk.form.run_method.runserverobj(method, docs=docs, dt=dt, dn=dn, arg=arg, args=args)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/desk/form/run_method.py", line 35, in runserverobj
    r = doc.run_method(method)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py", line 566, in run_method
    return Document.hook(fn)(self, *args, **kwargs)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py", line 722, in composer
    return composed(self, method, *args, **kwargs)
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py", line 705, in runner
    add_to_return_value(self, fn(self, *args, **kwargs))
  File "/home/frappe/frappe-bench/apps/frappe/frappe/model/document.py", line 560, in 
    fn = lambda self, *args, **kwargs: getattr(self, method)(*args, **kwargs)
  File "/home/frappe/frappe-bench/apps/erpnext/erpnext/selling/doctype/sms_center/sms_center.py", line 79, in send_sms
    send_sms(receiver_list, cstr(self.message))
  File "/home/frappe/frappe-bench/apps/erpnext/erpnext/setup/doctype/sms_settings/sms_settings.py", line 66, in send_sms
    send_via_gateway(arg)
  File "/home/frappe/frappe-bench/apps/erpnext/erpnext/setup/doctype/sms_settings/sms_settings.py", line 79, in send_via_gateway
    status = send_request(ss.sms_gateway_url, args)
  File "/home/frappe/frappe-bench/apps/erpnext/erpnext/setup/doctype/sms_settings/sms_settings.py", line 96, in send_request
    conn.request('GET', api_url + urllib.urlencode(args), headers = headers)    # send request
  File "/usr/lib/python2.7/httplib.py", line 1048, in request
    self._send_request(method, url, body, headers)
  File "/usr/lib/python2.7/httplib.py", line 1088, in _send_request
    self.endheaders(body)
  File "/usr/lib/python2.7/httplib.py", line 1044, in endheaders
    self._send_output(message_body)
  File "/usr/lib/python2.7/httplib.py", line 888, in _send_output
    self.send(msg)
  File "/usr/lib/python2.7/httplib.py", line 850, in send
    self.connect()
  File "/usr/lib/python2.7/httplib.py", line 831, in connect
    self.timeout, self.source_address)
  File "/usr/lib/python2.7/socket.py", line 557, in create_connection
    for res in getaddrinfo(host, port, 0, SOCK_STREAM):
 gaierror: [Errno -2] Name or service not known

How to send sms to a specific contact… or any way to check the sms by sending it to a mobile number…

Thanks,