Why Does My Flask App Throw a `TemplateNotFound` Error Even Though the Template File Exists?

TemplateNotFound Error in Flask Despite Existing Template File

When rendering a template in Flask, you may encounter a jinja2.exceptions.TemplateNotFound: [template_name] error, indicating that Flask cannot locate the specified template file. This can be frustrating, especially when the template file clearly exists in your project. Here's a closer examination of this issue and how to resolve it.

Incorrect Template Location

The most common reason for this error is that the template file is not in the correct location. Flask expects templates to be placed in the templates subdirectory adjacent to the Python module where the Flask app is created. Ensure that your home.html file is located in this subdirectory.

For example, if your Flask app file is app.py, the template directory should be structured as follows:

/myproject
    app.py
    templates/
        home.html

Custom Template Directory

If your templates are located in a non-default directory, you must specify its path using template_folder.

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

Debugging Template Loading

To help identify the reason behind the error, enable the EXPLAIN_TEMPLATE_LOADING option. Flask will then log detailed information about the template loading process.

app.config['EXPLAIN_TEMPLATE_LOADING'] = True

This can provide valuable insights into potential issues with the template search path.

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