Anvil-uplink connection error

Anvil Q&A
1

Dear Anvil,

I am new to Anvil, trying to follow the tutorial of using uplink from my own laptop. However I spent hours still can’t get a simple hello world example working

My client side code simply a button

from ._anvil_designer import Form1Template
from anvil import *
import anvil.server

class Form1(Form1Template):

  def __init__(self, **properties):
    # Set Form properties and Data Bindings.
    self.init_components(**properties)

    # Any code you write here will run when the form opens.

  def button_1_click(self, **event_args):
    """This method is called when the button is clicked"""
    anvil.server.call("say_hello", 'Hey')
    alert('Got it')

My server side code basically copied from the pop up window after click uplink.

import anvil.server

anvil.server.connect("<my uplink key>")

@anvil.server.callable
def say_hello(name):
  print("Hello from the uplink, %s!" % name)

anvil.server.wait_forever()

When runs the above script, I got messages:

Connecting to wss://anvil.works/uplink
Anvil websocket open
Connected to "Default environment" as SERVER

When run the app, and click the button, I got

AppOfflineError: Connection to server failed (error)
at Form1, line 15

Seems not connected to my laptop.

Please help, many thanks!