pls. tell me why?

Hi, thank you for the awesome post on Asynchronous Tasks with Flask and Celery.
I followed the steps to set up the project, but I got the following errors while trying to create the images and spin up the Docker container:

Traceback (most recent call last):
File "urllib3/connectionpool.py", line 677, in urlopen
File "urllib3/connectionpool.py", line 392, in _make_request
File "http/client.py", line 1252, in request
File "http/client.py", line 1298, in _send_request
File "http/client.py", line 1247, in endheaders
File "http/client.py", line 1026, in _send_output
File "http/client.py", line 966, in send
File "docker/transport/unixconn.py", line 43, in connect
ConnectionRefusedError: [Errno 111] Connection refused

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "requests/adapters.py", line 449, in send
File "urllib3/connectionpool.py", line 727, in urlopen
File "urllib3/util/retry.py", line 403, in increment
File "urllib3/packages/six.py", line 734, in reraise
File "urllib3/connectionpool.py", line 677, in urlopen
File "urllib3/connectionpool.py", line 392, in _make_request
File "http/client.py", line 1252, in request
File "http/client.py", line 1298, in _send_request
File "http/client.py", line 1247, in endheaders
File "http/client.py", line 1026, in _send_output
File "http/client.py", line 966, in send
File "docker/transport/unixconn.py", line 43, in connect
urllib3.exceptions.ProtocolError: ('Connection aborted.', ConnectionRefusedError(111, 'Connection refused'))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "docker/api/client.py", line 205, in _retrieve_server_version
File "docker/api/daemon.py", line 181, in version
File "docker/utils/decorators.py", line 46, in inner
File "docker/api/client.py", line 228, in _get
File "requests/sessions.py", line 543, in get
File "requests/sessions.py", line 530, in request
File "requests/sessions.py", line 643, in send
File "requests/adapters.py", line 498, in send
requests.exceptions.ConnectionError: ('Connection aborted.', ConnectionRefusedError(111, 'Connection refused'))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "bin/docker-compose", line 3, in
File "compose/cli/main.py", line 67, in main
File "compose/cli/main.py", line 123, in perform_command
File "compose/cli/command.py", line 69, in project_from_options
File "compose/cli/command.py", line 132, in get_project
File "compose/cli/docker_client.py", line 43, in get_client
File "compose/cli/docker_client.py", line 170, in docker_client
File "docker/api/client.py", line 188, in init
File "docker/api/client.py", line 213, in _retrieve_server_version
docker.errors.DockerException: Error while fetching server API version: ('Connection aborted.', ConnectionRefusedError(111, 'Connection refused'))
[22914] Failed to execute script docker-compose

Do you have any insights on how to solve this issue, or what might be the cause?
Thanks in advance!

Hi and thanks for this learning material
project/server/main/init.py and project/server/init.py both define the same content with create_app function

I removed the content of project/server/main/init.py to test and it seems working

Under the heading "Trigger a Task" I see button tags that close with anchor tags.

<button type="button" class="btn btn-primary" onclick="handleClick(1)">Short</a>
<button type="button" class="btn btn-primary" onclick="handleClick(2)">Medium</a>
<button type="button" class="btn btn-primary" onclick="handleClick(3)">Long</a>

I think it should be:

<button type="button" class="btn btn-primary" onclick="handleClick(1)">Short</button>
<button type="button" class="btn btn-primary" onclick="handleClick(2)">Medium</button>
<button type="button" class="btn btn-primary" onclick="handleClick(3)">Long</button>