Method Not Allowed: The method is not allowed for the requested URL.' when submitting text entry

Question

I am running flask python along with HTML, and the problem is simple:

It gives me error 405: Method Not Allowed: The method is not allowed for the requested URL. I have looked this up and people say to include methods=['GET', 'POST'] in the page route, but I already have this.

Python code:

@app.route('/')
@app.route('/home/', methods=['GET', 'POST'])
def home():
    global count
    guess = request.form.get('guess')
    result, valid = guess_word(guess, word, words)
    print(result, valid)
    try:
            guesses[count-1][2] = 'p'
    except:
            guesses[count-1][2] = ''
    if count < 6:
        if valid:
            guesses[count][0] = guess
            guesses[count][1] = result
    session['guesses'] = guesses
    if valid:
        count += 1
    return render_template('index.html', guesses=session['guesses'])

HTML code:

<div class="container2">
    <form method="post">
        <input type="text" placeholder="Guess" class="text-input" name="guess">
    </form>
</div>

This worked before, and I changed (what I thought was) nothing, but it suddenly stopped working. It gives me the error when I submit the text entry.