django.core.exceptions.ImproperlyConfigured: Field name is not valid for model

This error, django.core.exceptions.ImproperlyConfigured: Field name is not valid for model, usually occurs when there's a problem with the field name used in a Django model. To resolve this, follow these steps:

1. Check Field Name: Verify the field name used in your Django model. It should adhere to Python variable naming conventions. Ensure it doesn't contain spaces or special characters other than underscores.

2. Field Declaration: Confirm that the field is declared correctly within your model class, using valid field types provided by Django such as CharField, IntegerField, ForeignKey, etc.

3. Model Migration: If you've made changes to the field name or its properties, create and apply migrations using python manage.py makemigrations and python manage.py migrate commands. This will update the database schema to reflect the changes made in the model.

4. Inspect Related Code: Review any related code that interacts with this model field, such as forms, views, serializers, or any other part of your Django application. Ensure consistency in naming and usage throughout the codebase.

5. Database Inspection: If the issue persists, inspect the database directly to ensure that the field name matches the one specified in the model.

By following these steps, you should be able to identify and rectify the issue causing the Field name is not valid for model error in your Django application.