Getting exception while importing data though Django Admin

Exception:

\lib\site-packages\import_export\resources.py", line 581, in import_data

    raise ImproperlyConfigured

django.core.exceptions.ImproperlyConfigured

models.py

class Supplier(models.Model) :
    supplier_id = models.IntegerField(primary_key=True)
    supplier_name = models.CharField(null=False, max_length=500)

    def __str__(self) :
        return self.supplier_name

admin.py

from django.contrib import admin
from import_export.admin import ImportExportModelAdmin

from .models import *


# Register your models here.
# @admin.register(Supplier)
class SupplierAdmin(ImportExportModelAdmin) :
    pass

resources.py

from import_export import resources

from .models import *


class SupplierResource(resources.ModelResource) :
    class Meta :
        model = Supplier
        import_id_fields = ['supplier_id']

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