[▲ Vercel Community](/) · [Categories](/categories) · [Latest](/latest) · [Top](/top) · [Live](/live) [Help](/c/help/9) # Vercel App Deploment Failure for Jinja Based Website 80 views · 0 likes · 5 posts Goodbyekittyy (@goodbyekittyy) · 2024-08-01 Hi everyone, I am new to vercel.app! This is the repository I tried to deploy: https://github.com/GoodbyeKittyy/GoodbyeKittyy.github.io This is what happened:     Did I use the wrong Framework Preset? Do I need to change something in my repository? I would greatly appreciate any help! :smiley: Pauline P. Narvas (@pawlean) · 2024-08-01 Hi and welcome to the community, @goodbyekittyy! The error you're encountering indicates that Vercel is expecting a web application handler (either `handler` or `app`) to be defined in your `main.py`. The provided script appears to be generating a static HTML file, rather than running a web server. To resolve this, you can use a simple web framework like Flask to serve your generated HTML. You would need to specify the following in your `requirements.txt`: `Flask==2.1.1` Then you'd need to import Flask and define Flask App in you `main.py`. Something like: ``` from flask import Flask, render_template_string app = Flask(__name__) ``` And create Flask Route to Serve HTML. ``` @app.route("/") def index(): ``` And serve the application with Flask. ``` if __name__ == "__main__": app.run(host='0.0.0.0', port=8000) ``` [details="Full code example"] ``` from datetime import datetime import toml # type: ignore from jinja2 import Environment, FileSystemLoader # type: ignore from flask import Flask, render_template_string app = Flask(__name__) class Portfolio: # (class definition remains the same) portfolio = Portfolio() env = Environment(loader=FileSystemLoader("src/jinja")) env.filters["format_date"] = portfolio.format_date template = env.get_template("index.jinja") @app.route("/") def index(): about = portfolio.about() doing = portfolio.doing() social = portfolio.social() softskills = portfolio.softskills() technologies = portfolio.technologies() resume = portfolio.resume() projects = portfolio.projects() blog = portfolio.blog() categories = portfolio.categories() html_render = template.render( about=about, social=social, doing=doing, softskills=softskills, technologies=technologies, resume=resume, projects=projects, blog=blog, categories=categories, ) return render_template_string(html_render) if __name__ == "__main__": app.run(host='0.0.0.0', port=8000) ``` [/details] These changes convert the script from generating a static HTML file to serving the HTML via a Flask web application, allowing it to be deployed on Vercel. I've also linked related documentation from Flask in case it's helpful: https://flask.palletsprojects.com/en/3.0.x/ Goodbyekittyy (@goodbyekittyy) · 2024-08-02 @pawlean Hello! Thank you for your helpful comment :smiley: I have one question about the host, 0.0.0.0 is just an example or it's the default I should use? How can I find it if I have to change it? Pauline P. Narvas (@pawlean) · 2024-08-02 Oops, sorry! You can actually change that to just: ``` app.run() ``` You'd only specify that in development :slight_smile: Vercel will handle these settings for you. Goodbyekittyy (@goodbyekittyy) · 2024-08-12 @pawlean Hi there! Thanks for your help. I have managed to deploy it. The website looks very weird and I am guessing it's missing the css. Do you know what I need to change or include because of my Jinja usage? :smiley: Current Deployment: https://zy-resume.vercel.app/  What it should look like: https://goodbyekittyy.github.io/ 
