I'm having an issue with migrating my Django application. 

I encounter the following errors when trying to migrate:
ERRORS:
accounts.Availability.channel: (fields.E300) Field defines a relation with 
model 'Channel', which is either not installed, or is abstract.
accounts.Correspondence.channel: (fields.E300) Field defines a relation with 
model 'Channel', which is either not installed, or is abstract.
accounts.Todo.channel: (fields.E300) Field defines a relation with model 
'Channel', which is either not installed, or is abstract.
marketplace.Deliverable.channel: (fields.E300) Field defines a relation with 
model 'Channel', which is either not installed, or is abstract.
marketplace.OfflineServiceRequest.channel: (fields.E300) Field defines a 
relation with model 'Channel', which is either not installed, or is abstract
.
marketplace.OperatorReview.channel: (fields.E300) Field defines a relation 
with model 'Channel', which is either not installed, or is abstract.
marketplace.Service.channel: (fields.E300) Field defines a relation with 
model 'Channel', which is either not installed, or is abstract.
marketplace.ServiceDelivery.channel: (fields.E300) Field defines a relation 
with model 'Channel', which is either not installed, or is abstract.


My installed apps definition:
DJANGO_APPS = [
    'suit',                    
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles', 
    'django.contrib.sites',    
    ]


LOCAL_APPS = [                 
    'thriive_api.accounts',    
    'thriive_api.utils',       
    'thriive_api.marketplace', 
    'thriive_api.conversations',  
    'thriive_api.transactions'                                             
                                                            
    ]


THIRDPARTY_APPS = [            
    'rest_framework_jwt',      
    'rest_framework',          
    'charity_check',           
    'restframework_stripe',    
    'redis_pubsub',            
    ]


INSTALLED_APPS = DJANGO_APPS + THIRDPARTY_APPS + LOCAL_APPS

and I'm referring to the model directly in the FK relation in my model 
definitions:
from redis_pubsub.models import Channel

class Availability(models.Model):
   channel = models.ForeignKey(Channel)

It seems like the migrations can't find the `redis_pubsub.Channel` model, 
which is installed in `THIRDPARTY_APPS` and is not abstract. The migration 
files themselves also refer to the correct model path (e.g. 
`redis_pubsub.Channel`), so what gives? Does anyone know what's going on 
here?

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