flask 'hello world' not working
<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>