[Python] Getting TypeError: cannot unpack non-iterable NoneType object for Flask(__name__)...

I am getting "TypeError: cannot unpack non-iterable NoneType object" while trying to run the simple flask web application.

Code Snipet:

from flask import Flask, redirect, url_for, render_template, request

app = Flask(__name__)


@app.route('/')
def welcome_page():
return render_template('index.html')


@app.route('/output', methods=['GET'])
def fetch_channel():
if request.method == 'GET':
channel_search = request.form.to_dict()
channel_name = channel_search["search"]
return render_template(
'output.html', name = channel_name)


if __name__ == '__main__ ':
app.run()


Detailed error:

File "C:\Program Files\JetBrains\PyCharm Community Edition 2023.1.2\plugins\python-ce\helpers\pydev\_pydevd_bundle\pydevd_comm.py", line 1245, in do_it
_typeName, val_dict = pydevd_vars.resolve_compound_variable_fields(self.thread_id, self.frame_id, self.scope, self.attributes, dbg.get_user_type_renderers())
TypeError: cannot unpack non-iterable NoneType object```

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