Celery in Docker won't start

[bykof]

What I'm trying to achieve

Hi guys,
I want to develop saleor with docker-compose

Steps to reproduce the problem

1. I pulled the project via: git clone https://github.com/mirumee/saleor.git.
2. Then I run docker-compose up.
3. Error shows up

What I expected to happen

That it should work? :D

Stacktrace

celery_1  |  -------------- celery@1c13f3acc574 v4.2.1 (windowlicker)
celery_1  | ---- **** -----
celery_1  | --- * ***  * -- Linux-4.9.125-linuxkit-x86_64-with-debian-9.6 2018-11-30 07:28:26
celery_1  | -- * - **** ---
celery_1  | - ** ---------- [config]
celery_1  | - ** ---------- .> app:         saleor:0x7f40d790b438
celery_1  | - ** ---------- .> transport:   redis://redis:6379/1
celery_1  | - ** ---------- .> results:
celery_1  | - *** --- * --- .> concurrency: 4 (prefork)
celery_1  | -- ******* ---- .> task events: OFF (enable -E to monitor tasks in this worker)
celery_1  | --- ***** -----
celery_1  |  -------------- [queues]
celery_1  |                 .> celery           exchange=celery(direct) key=celery
celery_1  |
celery_1  |
celery_1  | [tasks]
celery_1  |   . saleor.account.emails.send_account_delete_confirmation_email
celery_1  |   . saleor.account.emails.send_password_reset_email
celery_1  |   . saleor.core.analytics.ga_report
celery_1  |   . saleor.dashboard.emails.send_promote_customer_to_staff_email
celery_1  |   . saleor.dashboard.emails.send_set_password_email
celery_1  |   . saleor.order.emails.send_fulfillment_confirmation
celery_1  |   . saleor.order.emails.send_fulfillment_update
celery_1  |   . saleor.order.emails.send_order_confirmation
celery_1  |   . saleor.order.emails.send_payment_confirmation
celery_1  |   . saleor.product.tasks.update_variants_names
celery_1  |   . saleor.product.thumbnails.create_category_background_image_thumbnails
celery_1  |   . saleor.product.thumbnails.create_collection_background_image_thumbnails
celery_1  |   . saleor.product.thumbnails.create_product_thumbnails
celery_1  |
celery_1  | [2018-11-30 07:28:27,403: INFO/MainProcess] Connected to redis://redis:6379/1
celery_1  | [2018-11-30 07:28:27,412: INFO/MainProcess] mingle: searching for neighbors
celery_1  | [2018-11-30 07:28:28,434: INFO/MainProcess] mingle: all alone
celery_1  | [2018-11-30 07:28:28,453: WARNING/MainProcess] /usr/local/lib/python3.6/site-packages/celery/fixups/django.py:200: UserWarning: Using settings.DEBUG leads to a memory leak, never use this setting in production environments!
celery_1  |   warnings.warn('Using settings.DEBUG leads to a memory leak, never '
celery_1  | [2018-11-30 07:28:28,453: INFO/MainProcess] celery@1c13f3acc574 ready.
celery_1  | [2018-11-30 07:28:28,606: CRITICAL/MainProcess] Unrecoverable error: AttributeError("'float' object has no attribute 'items'",)
celery_1  | Traceback (most recent call last):
celery_1  |   File "/usr/local/lib/python3.6/site-packages/celery/worker/worker.py", line 205, in start
celery_1  |     self.blueprint.start(self)
celery_1  |   File "/usr/local/lib/python3.6/site-packages/celery/bootsteps.py", line 119, in start
celery_1  |     step.start(parent)
celery_1  |   File "/usr/local/lib/python3.6/site-packages/celery/bootsteps.py", line 369, in start
celery_1  |     return self.obj.start()
celery_1  |   File "/usr/local/lib/python3.6/site-packages/celery/worker/consumer/consumer.py", line 317, in start
celery_1  |     blueprint.start(self)
celery_1  |   File "/usr/local/lib/python3.6/site-packages/celery/bootsteps.py", line 119, in start
celery_1  |     step.start(parent)
celery_1  |   File "/usr/local/lib/python3.6/site-packages/celery/worker/consumer/consumer.py", line 593, in start
celery_1  |     c.loop(*c.loop_args())
celery_1  |   File "/usr/local/lib/python3.6/site-packages/celery/worker/loops.py", line 91, in asynloop
celery_1  |     next(loop)
celery_1  |   File "/usr/local/lib/python3.6/site-packages/kombu/asynchronous/hub.py", line 354, in create_loop
celery_1  |     cb(*cbargs)
celery_1  |   File "/usr/local/lib/python3.6/site-packages/kombu/transport/redis.py", line 1040, in on_readable
celery_1  |     self.cycle.on_readable(fileno)
celery_1  |   File "/usr/local/lib/python3.6/site-packages/kombu/transport/redis.py", line 337, in on_readable
celery_1  |     chan.handlers[type]()
celery_1  |   File "/usr/local/lib/python3.6/site-packages/kombu/transport/redis.py", line 724, in _brpop_read
celery_1  |     self.connection._deliver(loads(bytes_to_str(item)), dest)
celery_1  |   File "/usr/local/lib/python3.6/site-packages/kombu/transport/virtual/base.py", line 983, in _deliver
celery_1  |     callback(message)
celery_1  |   File "/usr/local/lib/python3.6/site-packages/kombu/transport/virtual/base.py", line 632, in _callback
celery_1  |     self.qos.append(message, message.delivery_tag)
celery_1  |   File "/usr/local/lib/python3.6/site-packages/kombu/transport/redis.py", line 149, in append
celery_1  |     pipe.zadd(self.unacked_index_key, time(), delivery_tag) \
celery_1  |   File "/usr/local/lib/python3.6/site-packages/redis/client.py", line 2263, in zadd
celery_1  |     for pair in iteritems(mapping):
celery_1  |   File "/usr/local/lib/python3.6/site-packages/redis/_compat.py", line 123, in iteritems
celery_1  |     return iter(x.items())
celery_1  | AttributeError: 'float' object has no attribute 'items'

Screenshots

Possible solution

The error is related to following problem: celery/celery#5175
They say that one should use plain celery and redis = "~=2.10.6".

System information
Operating system: Mac OSX 10.14.1
Browser: Chrome?