Flask PyMongo connection error: Unknown option connect

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I am running flask app which connects to MongoDB hosted at mlab. Here is the code snippet. 

from flask import Flask
from flask_pymongo import PyMongo
app = Flask(__name__)
app.config['MONGO_DBNAME'] = 'my-db-name'
app.config['MONGO_URI'] = 'mongodb://<username>:<password>@ds061474.mlab.com:61474/<db-name>'
mongo = PyMongo(app)

When I run flask from terminal (after adding username:password and db name, I get follow error (screenshot below)[!: pymongo.errors.ConfigurationError: Unknown option connect enter image description here

I am running:

Flask: 1.0.2
Flask-PyMongo: 2.2.0
Python: 3.7.0

Can someone help?

pymongo flask python-3.x
1 Answers

After quite a bit of debug, I was able to find issue. I removed package flask-pymongo and re-installed it and noticed following error which was the issue:
flask-pymongo 2.2.0 has requirement PyMongo>=3.0, but you'll have pymongo 2.8.1 which is incompatible.

So I added PyMongo>=3.0 to my requirements.txt file before flask-pymongo and re-installed modules by running pip install -r requirements.txt

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