No module named 'django.core.urlresolvers'

The error message "No module named 'django.core.urlresolvers'" indicates that the module 'django.core.urlresolvers' is not found or not installed in the Django framework. Here are the steps to troubleshoot and resolve this issue:

1. Check Django installation: Ensure that Django is properly installed in your Python environment. You can check the installed packages by running the command pip freeze or pip list. Look for the 'Django' package in the list. If it is not installed, you can install it using pip install django.

2. Update Django version: If Django is already installed, make sure you have the latest version. You can update Django using the command pip install --upgrade django.

3. Check import statement: Verify that you are importing the correct module in your code. In older versions of Django (before version 2.0), the import statement for 'django.core.urlresolvers' was used. However, in Django 2.0 and later versions, the import statement has been changed to 'django.urls'. Update your import statement accordingly.

4. Check Django version compatibility: If you are using a third-party library or framework that relies on an older version of Django, it may still use the deprecated 'django.core.urlresolvers' module. In such cases, you may need to either update the library or use an older version of Django that is compatible with the library.

5. Check virtual environment: If you are using a virtual environment, make sure you have activated it before running your Django project. Activating the virtual environment ensures that the correct version of Django is being used.

6. Reinstall Django: If none of the above steps work, you can try reinstalling Django completely. First, uninstall Django using pip uninstall django, and then reinstall it using pip install django.

By following these steps, you should be able to resolve the "No module named 'django.core.urlresolvers'" error and continue working with Django.