Code
----

```
client = pymongo.MongoClient("mongodb+srv://username:password@cluster0.zcui8.mongodb.net/db?retryWrites=true&w=majority&ssl=true&ssl_cert_reqs=CERT_NONE")
db = client["db"]

#this gives the error
res = list(db.listings.find({}).limit(15).sort([('$natural',-1)]))

```

Error:
------

```
pymongo.errors.ServerSelectionTimeoutError: No replica set members found yet

```

I get this error in the line where I assign the variable `res`.
And I don't get this error when run it on my machine, but when i run it on a server i get the error.