Celery "Worker-n" pid: xxxx exited with "exitcode 1" when I import hmmlearn

In my tasks.py file, when I import hmmlearn,

from hmmlearn import hmm

      

        
        
        
      

    

and start working with celery, I get the following error:

[2017-06-14 09:18:27,638: INFO/MainProcess] Received task: 
sm.tasks.mytask[4e46806e-6f0f-420f-baac-c727c2a382d4]
[2017-06-14 09:18:27,716: ERROR/MainProcess] Process 'Worker-4' pid:5264 
exited with 'exitcode 1'
[2017-06-14 09:18:29,857: ERROR/MainProcess] Process 'Worker-7' pid:3172 
exited with 'exitcode 1'
[2017-06-14 09:18:29,857: ERROR/MainProcess] Process 'Worker-6' pid:5768 
exited with 'exitcode 1'
[2017-06-14 09:18:29,857: ERROR/MainProcess] Process 'Worker-5' pid:5236 
exited with 'exitcode 1'
[2017-06-14 09:18:31,450: ERROR/MainProcess] Process 'Worker-8' pid:5876 
exited with 'exitcode 1'

      

        
        
        
      

    

And after I turned off the worker,

[2017-06-14 09:19:28,545: WARNING/MainProcess] c:\anaconda3\lib\site-
packages\celery\apps\worker.py:161: CDeprecationWarning:
Starting from version 3.2 Celery will refuse to accept pickle by default.

      

        
        
        
      

    

If I just comment out that the imports and code use this imports everything works fine. But I can do all tasks (including hmm code) as standalone python code on ipython without any problem.

I am using conda distribution with the following details

Current conda install:

           platform : win-64
      conda version : 4.3.21
   conda is private : False
  conda-env version : 4.3.21
conda-build version : 1.21.3
     python version : 3.5.2.final.0
   requests version : 2.14.2

λ conda list | grep celery
celery                    3.1.18                    <pip>

λ conda list | grep kombu
kombu                     3.0.37                    <pip>

λ conda list | grep hmmlearn
hmmlearn                  0.1.1               np111py35_0    omnia

      

        
        
        
      

    

What should I do?