Django : How to resolve "django.core.exceptions.ImproperlyConfigured: Application labels aren't uniq

Django : How to resolve "django.core.exceptions.ImproperlyConfigured: Application labels aren't unique, duplicates: foo" in Django 1.7?
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Django : How to resolve "django.core.exceptions.ImproperlyConfigured: Application labels aren't unique, duplicates: foo" in Django 1.7?
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