title: flask 'hello world' not working
body: <p>I copy pasted the flask's 'hello world' app from their website and am trying to run it. I get an error message in Chrome saying </p>
  
  <pre><code>Internal Server Error
  
  The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.
  </code></pre>
  
  <p>Here is the 'hello world' app straight from flasks website</p>
  
  <pre><code>from flask import Flask
  app = Flask(__name__)
  
  @app.route('/')
  def hello_world():
      return 'Hello World!'
  
  if __name__ == '__main__':
      app.debug = True
      app.run()
  </code></pre>
  
  <p>What I have tried:</p>
  
  <p>-temporarily disabling Avast!</p>
  
  <p>-disabling windows firewall</p>
  
  <p>-ensuring that the flask module is installed</p>
  
  <p>This was working a couple days ago actually...</p>