title: FLASK The requested URL was not found on the server
body: <pre><code>import sqlite3
  from flask import Flask, render_template, request
  
  app=Flask(__name__)
  
  @app.route('/addarticle',methods = ['POST'])
  def addarticle():
      return render_template('addarticle.html')
  </code></pre>
  <br>
  <p><img src="https://i.stack.imgur.com/5cyO6.png" alt="Project folder" /></p>
  <blockquote>
  <p>The requested URL was not found on the server. If you entered the URL manually please check your spelling and try again.</p>
  </blockquote>
  <p>I'm getting this error how could I fix it?</p>