I've been trying to get my register page to work for a couple days now. I think I'm close , but now I'm receiving the following error message in my terminal when I try to click register from the login page:

File "/home/ubuntu/workspace/pset7/finance/application.py", line 175, in errorhandler

return apology(e.name, e.code)

AttributeError: 'ValueError' object has no attribute 'name'

Here is my code from the lines the error is pointing to (I didn't write them, they were provided with the distribution code):

def errorhandler(e):
"""Handle error"""
return apology(e.name, e.code)

Any help would be greatly appreciated. I will include my register function code from application.py just in case that helps:

 @app.route("/register", methods=["GET", "POST"])
def register():
    """Register user"""
    # User reached route via POST (as by submitting a form via POST)
    if request.method == "POST":

        # Ensure username was submitted
        if not request.form.get("username"):
            return apology("must provide username", 403)

        # Ensure password was submitted
        elif not request.form.get("password"):
            return apology("must provide password", 403)

        # Ensure password == confirmation
        elif request.form.get("password") != request.form.get("confirmation"):
            return apology("password and confirmation do not match", 403)

        # Ensure username is not already taken
        rows = db.execute("SELECT * FROM users WHERE username = :username",
        if len(rows) == 1:
            return apology("username already taken. please choose another", 403)

        # Add new user to the database
        session["user_id"] = db.execute("INSERT INTO users(username, hash) VALUES(:username, :hash)", username=request.form.get("username"), \

        # Redirect user to home page
        return redirect("/")

Thanks! ~Andy

Edit* Here is the full response leading to the error (is this called a stack trace?)

 * Serving Flask app "application"
 * Running on http://ide50-aherzfeld.cs50.io:8080/ (Press CTRL+C to quit)
 * Restarting with stat
INFO:werkzeug: - - [28/Jun/2018 04:53:48] "GET / HTTP/1.1" 302 -
INFO:werkzeug: - - [28/Jun/2018 04:53:49] "GET /login HTTP/1.1" 200 -
INFO:werkzeug: - - [28/Jun/2018 04:53:49] "GET /static/styles.css HTTP/1.1" 200 -
[2018-06-28 04:54:05,649] ERROR in app: Exception on /register [GET]
Traceback (most recent call last):
  File "/opt/pyenv/versions/3.6.0/lib/python3.6/site-packages/flask/app.py", line 1982, in wsgi_app
    response = self.full_dispatch_request()
  File "/opt/pyenv/versions/3.6.0/lib/python3.6/site-packages/flask/app.py", line 1615, in full_dispatch_request
    return self.finalize_request(rv)
  File "/opt/pyenv/versions/3.6.0/lib/python3.6/site-packages/flask/app.py", line 1630, in finalize_request
    response = self.make_response(rv)
  File "/opt/pyenv/versions/3.6.0/lib/python3.6/site-packages/flask/app.py", line 1725, in make_response
    raise ValueError('View function did not return a response')
ValueError: View function did not return a response
INFO:werkzeug: - - [28/Jun/2018 04:54:05] "GET /register HTTP/1.1" 500 -
ERROR:werkzeug:Error on request:
Traceback (most recent call last):
  File "/opt/pyenv/versions/3.6.0/lib/python3.6/site-packages/werkzeug/serving.py", line 270, in run_wsgi
  File "/opt/pyenv/versions/3.6.0/lib/python3.6/site-packages/werkzeug/serving.py", line 258, in execute
    application_iter = app(environ, start_response)
  File "/opt/pyenv/versions/3.6.0/lib/python3.6/site-packages/flask/app.py", line 1997, in __call__
    return self.wsgi_app(environ, start_response)
  File "/opt/pyenv/versions/3.6.0/lib/python3.6/site-packages/flask/app.py", line 1985, in wsgi_app
    response = self.handle_exception(e)
  File "/opt/pyenv/versions/3.6.0/lib/python3.6/site-packages/flask/app.py", line 1547, in handle_exception
    return self.finalize_request(handler(e), from_error_handler=True)
  File "/home/ubuntu/workspace/pset7/finance/application.py", line 176, in errorhandler
    return apology(e.name, e.code)
AttributeError: 'ValueError' object has no attribute 'name'
  • Is there more on the console than just this, like a stack trace? Maybe something where your code is mentioned? The error handler failing at least implies there has been an error it tried to process.
    – Blauelf
    Commented Jun 27, 2018 at 10:48
  • Here is the full chain leading to the error (would this be called a stack trace?):
    – aherzfeld
    Commented Jun 28, 2018 at 4:55
  • I'm a bit lost because as far as I can see, the problem is not related to the code I've written
    – aherzfeld
    Commented Jun 28, 2018 at 4:57

1 Answer 1


I just solved it! I noticed this: ERROR in app: Exception on /register [GET]

So it seemed like the error must be related the the [GET] side of things. I took a look at /login and it had the following else statement at the bottom of its block:

(I changed the login.html to register.html)

# User reached route via GET (as by clicking a link or via redirect)
    return render_template("register.html")

I guess the problem was that I was handling POST requests, but not GET requests. This last else statement ensures that the page will be rendered for someone following the link. Thanks again for the help!

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