View function mapping is overwriting an existing endpoint function: index

[rarevesselt]

sorry, at the moment I can not offer advise, structure looks fine and in accordance with the recommendation
I haven't use flask_script and frankly for what you use it here I would simply use separate script, without link/import of app that seems to cause the problem.
As a side note - maybe it's better to migrate to new Flask CLI

Thanks once again buran and others.
I have learnt a lot on this error.
As you said,the code and structure is fine.However, it is difficult to pin point what is causing the error.I have check the code I posted earlier the one am posting now.I found no real difference.

This is the __init__.py:

import os

from flask import Flask
from flask_sqlalchemy import SQLAlchemy

basedir = os.path.abspath(os.path.dirname(__file__))

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI']= 'sqlite:///' + os.path.join(basedir,'thermos.db')
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
app.config['DEBUG'] = True
db = SQLAlchemy(app)

import models
import views

and manage.py:

#! /usr/bin/env python

from thermos import app,db
from thermos.models import User
from flask_script import Manager,prompt_bool

manager = Manager(app)

@manager.command
def initdb():
    db.create_all()
    db.session.add(User(username='olatunji',email='[email protected]'))
    db.session.add(User(username='ayobami',email='[email protected]'))
    db.session.commit()
    print "Initialized the database"
    
@manager.command
def dropdb():
    if prompt_bool(
        "Are you sure you want to lose all your data"):
        db.drop_all()
        print 'Dropped the database'

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

and views.py:

from flask import render_template,flash,redirect,url_for

from thermos import app,db
from forms import BookmarkForm
from models import User,Bookmark

def logged_in_user():
    return User.query.filter_by(username='olatunji').first()


@app.route('/index')
def index():
    return render_template('index.html',new_bookmarks=Bookmark.newest(5))

@app.route("/add",methods=['GET','POST'])
def add():
    form = BookmarkForm()
    if form.validate_on_submit():
        url = form.url.data
        description =form.description.data
        bm = Bookmark(user=logged_in_user(),url=url,description=description)
        db.session.add(bm)
        db.session.commit()
        flash("Stored '{}'".format(description))
        return redirect(url_for('index'))
    return render_template("add.html",form=form)
   
@app.errorhandler(404)
def page_not_found(e):
    return render_template('404.html'),404

@app.errorhandler(500)
def server_error(e):
    return render_template('500.html'),500


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

The new code is running without throwing the error.