Framework Error

What This Error Means

This error occurs when the template engine specified in the Flask application is not properly configured or not installed.

Why It Happens

This error happens because the Flask application is trying to render a template using a template engine that is not available in the environment. This can be due to a misconfigured application or a missing dependency.

How to Fix It

1. 1To fix this error, you need to install the Jinja2 library by running the command `pip install Jinja2` in your terminal. If you are using a virtual environment, make sure to activate it before installing the library. Alternatively, you can change the template engine in your Flask application to a different one, such as Mako or Chameleon.

Example Code Solution

from flask import Flask
app = Flask(__name__)
app.config['TEMPLATES_AUTO_RELOAD'] = True

from flask import Flask
from jinja2 import Environment
app = Flask(__name__)
env = Environment(auto_reload=True)
app.config['JINJA2_ENV'] = env