Why Does Flask Show a 'TemplateNotFound' Error Even When My `home.html` File Exists?

Flask TemplateNotFound Error

Despite the existence of a home.html file in your project, an error message "jinja2.exceptions.TemplateNotFound: home.html" appears when attempting to render the template. This error indicates that Flask cannot locate the template file.

Solution

Ensure that your template file is located in the proper directory. By default, Flask expects template files to be placed in the templates subdirectory adjacent to the Python module where the Flask application is created. Verify that you have created this subdirectory and placed the home.html file within it. If your app is structured as a Python package, the templates folder should be placed within the package itself.

If you prefer to use a different directory for your templates, you can modify Flask's configuration as follows:

app = Flask(__name__, template_folder='custom_templates_folder')

Error Investigation

To troubleshoot why Flask is unable to find a specific template, enable the EXPLAIN_TEMPLATE_LOADING option in your Flask app configuration:

app.config['EXPLAIN_TEMPLATE_LOADING'] = True

When rendering a template, Flask will log detailed information regarding the search process to the app.logger, providing insight into where the template was searched and why it was not found.

Blueprint Templates

Blueprint blueprints can specify their own template directories, although this is not required if blueprints are primarily used for organizing large projects into logical units.

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