ModuleNotFoundError: No module named 'flask_wtf'

This error message is indicating that Flask-WTF module is not installed or cannot be found by the Python interpreter. Flask-WTF is a Flask extension that provides integration with WTForms, a flexible forms validation and rendering library. To resolve this issue, you need to install Flask-WTF module using pip command in your terminal or command prompt:

pip install Flask-WTF

Once installed, you can import and use the Flask-WTF module in your Flask application.