TypeError: can't pickle memoryview objects when running basic add.delay(1,2) test - python-3.x

Question

Trying to run the most basic test of add.delay(1,2) using celery 4.1.0 with Python 3.6.4 and getting the following error:
[2018-02-27 13:58:50,194: INFO/MainProcess] Received task:
exb.tasks.test_tasks.add[52c3fb33-ce00-4165-ad18-15026eca55e9]
[2018-02-27 13:58:50,194: CRITICAL/MainProcess] Unrecoverable error:
SystemError(' returned a result with an error set',) Traceback (most
recent call last): File
"/opt/myapp/lib/python3.6/site-packages/kombu/messaging.py", line 624,
in _receive_callback
return on_m(message) if on_m else self.receive(decoded, message) File
"/opt/myapp/lib/python3.6/site-packages/celery/worker/consumer/consumer.py",
line 570, in on_task_received
callbacks, File "/opt/myapp/lib/python3.6/site-packages/celery/worker/strategy.py",
line 145, in task_message_handler
handle(req) File "/opt/myapp/lib/python3.6/site-packages/celery/worker/worker.py", line
221, in _process_task_sem
return self._quick_acquire(self._process_task, req) File "/opt/myapp/lib/python3.6/site-packages/kombu/async/semaphore.py",
line 62, in acquire
callback(*partial_args, **partial_kwargs) File "/opt/myapp/lib/python3.6/site-packages/celery/worker/worker.py", line
226, in _process_task
req.execute_using_pool(self.pool) File "/opt/myapp/lib/python3.6/site-packages/celery/worker/request.py",
line 531, in execute_using_pool
correlation_id=task_id, File "/opt/myapp/lib/python3.6/site-packages/celery/concurrency/base.py",
line 155, in apply_async
**options) File "/opt/myapp/lib/python3.6/site-packages/billiard/pool.py", line 1486,
in apply_async
self._quick_put((TASK, (result._job, None, func, args, kwds))) File
"/opt/myapp/lib/python3.6/site-packages/celery/concurrency/asynpool.py",
line 813, in send_job
body = dumps(tup, protocol=protocol) TypeError: can't pickle memoryview objects
The above exception was the direct cause of the following exception:
Traceback (most recent call last): File
"/opt/myapp/lib/python3.6/site-packages/celery/worker/worker.py", line
203, in start
self.blueprint.start(self) File "/opt/myapp/lib/python3.6/site-packages/celery/bootsteps.py", line
119, in start
step.start(parent) File "/opt/myapp/lib/python3.6/site-packages/celery/bootsteps.py", line
370, in start
return self.obj.start() File "/opt/myapp/lib/python3.6/site-packages/celery/worker/consumer/consumer.py",
line 320, in start
blueprint.start(self) File "/opt/myapp/lib/python3.6/site-packages/celery/bootsteps.py", line
119, in start
step.start(parent) File "/opt/myapp/lib/python3.6/site-packages/celery/worker/consumer/consumer.py",
line 596, in start
c.loop(*c.loop_args()) File "/opt/myapp/lib/python3.6/site-packages/celery/worker/loops.py", line
88, in asynloop
next(loop) File "/opt/myapp/lib/python3.6/site-packages/kombu/async/hub.py", line 354,
in create_loop
cb(*cbargs) File "/opt/myapp/lib/python3.6/site-packages/kombu/transport/base.py", line
236, in on_readable
reader(loop) File "/opt/myapp/lib/python3.6/site-packages/kombu/transport/base.py", line
218, in _read
drain_events(timeout=0) File "/opt/myapp/lib/python3.6/site-packages/librabbitmq-2.0.0-py3.6-linux-x86_64.egg/librabbitmq/init.py",
line 227, in drain_events
self._basic_recv(timeout) SystemError: returned a result with an error set
I cannot find any previous evidence of anyone hitting this error. I noticed from the celery site that only python 3.5 is mentioned as supported, is that the issue or is this something I am missing?
Any help would be much appreciated!
UPDATE: Tried with Python 3.5.5 and the problem persists. Tried with Django 4.0.2 and the problem persists.
UPDATE: Uninstalled librabbitmq and the problem stopped. This was seen after migration from Python 2.7.5, Django 1.7.7 to Python 3.6.4, Django 2.0.2.

Answer 1

After uninstalling librabbitmq, the problem was resolved.