Error while creating export job with celery

[N1K1TAS95]

Hi there!
I have and issue creating and export job using celery.
Each time I'm getting this error: TypeError: str() argument 'encoding' must be str, not tuple

Stack Trace:

Traceback (most recent call last):
  File "/usr/local/lib/python3.11/site-packages/celery/app/trace.py", line 453, in trace_task
    R = retval = fun(*args, **kwargs)
                 ^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sentry_sdk/utils.py", line 1730, in runner
    return sentry_patched_function(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sentry_sdk/integrations/celery/__init__.py", line 406, in _inner
    reraise(*exc_info)
  File "/usr/local/lib/python3.11/site-packages/sentry_sdk/utils.py", line 1659, in reraise
    raise value
  File "/usr/local/lib/python3.11/site-packages/sentry_sdk/integrations/celery/__init__.py", line 401, in _inner
    return f(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/celery/app/trace.py", line 736, in __protected_call__
    return self.run(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/import_export_celery/tasks.py", line 220, in run_export_job
    class Resource(resource_class):
TypeError: str() argument 'encoding' must be str, not tuple

Here is my configurations for ModelResource:

class OdlExportForISOResource(resources.ModelResource):
    code = Field(
        attribute='code',
        column_name='Codice',
        widget=CharWidget()
    )
    state = Field(
        attribute='state',
        column_name='Stato',
        widget=ChoicesWidget(
            choices=ODL_STATES
        )
    )
    creation_date = Field(
        attribute='creation_date',
        column_name='Data Apertura',
        widget=DateTimeWidget(format='%d/%m/%Y')
    )
    data_primo_intervento = Field(
        attribute='data_primo_intervento',
        column_name='Data Primo Intervento',
        widget=DateTimeWidget(format='%d/%m/%Y')
    )
    closing_date = Field(
        attribute='closing_date',
        column_name='Data Chiusura',
        widget=DateTimeWidget(format='%d/%m/%Y')
    )

    tipologia = Field(
        attribute='tipologia',
        column_name='Tipologia',
        widget=CharWidget()
    )
    in_garanzia = Field(
        attribute='in_garanzia',
        column_name='In Garanzia',
        widget=BooleanWidget()
    )
    rapporto_fgas = Field(
        attribute='rapporto_fgas',
        column_name='Rapporto FGAS',
        widget=BooleanWidget()
    )
    soddisfazione_cliente = Field(
        attribute='soddisfazione_cliente',
        column_name='Soddisfazione Cliente',
        widget=CharWidget()
    )

    class Meta:
        name= 'Esporta gli ODL per la ISO'
        model = Odl
        fields = [
            'code',
            'state',
            'creation_date',
            'data_primo_intervento',
            'closing_date',
            'tipologia',
            'in_garanzia',
            'rapporto_fgas',
            'soddisfazione_cliente'
        ]

    def get_queryset(self):
        queryset = super().get_queryset()
        queryset = queryset.prefetch_related(
            'odl_intervention_reports',
            'odl_type'
        )
        return queryset

This is a classmethod:

@classmethod
    def export_resource_classes(cls):
        return {
            'odl': ('ODL Export for ISO Resource', 'odl.resources.OdlExportForISOResource'),
        }

And this is creation of export job: