'NoneType' object has no attribute 'run'

[EmadMokhtar]

I set up a wizard to import a CSV file into my project. I used the default settings.
I register a drf serializer not Django model.

Python version: 2.7.13
Django version: 1.8.7
Data Wizard version: 1.2.0
URL: http://localhost:8000/datawizard/7/auto/
Error: {"error": {"message": "'NoneType' object has no attribute 'run'"}}
Settings:

DATA_WIZARD = {
    'BACKEND': 'data_wizard.backends.threading',
    'LOADER': 'data_wizard.loaders.FileLoader',
    'PERMISSION': 'rest_framework.permissions.IsAdminUser',
}

I also tried 'data_wizard.backends.immediate'

I'm assuming the issue with backend.run()

    def run_task(self, name, use_async=False, post=None,
                 backend=None, user=None):
        if not backend:
            backend = data_wizard_backend
        if not user:
            user = self.user
        return backend.run(
            name, self.pk, user.pk, use_async, post,
        )

[sheppard]

I was finally able to replicate this issue. It can happen if data_wizard.views is imported before data_wizard.apps.WizardConfig.ready() is called. For example, this can happen if "wq.db.rest" is listed in INSTALLED_APPS before "data_wizard".

For the next release, I updated data_wizard.views to make it less dependent on import order. To work around this issue for now, try moving "data_wizard" to an earlier position in your INSTALLED_APPS.