Mongo DB showing an error Fatal error: Uncaught exception 'MongoConnectionException' with message 'Operation now in progress' in PHP. How to resolve this error and why this error comes.
This typically means the driver has issues connecting to the database. I've learned this through the very first result in Google when pasting your question ;)
As Remon said, "I have an error please help" doesn't work very well when asking programming questions.
Usual things to make sure are, that Mongodb is running and you are connecting to the right host:port e.g.
$m = new Mongo();
If it's not in the localhost (your machine) and default port try this.
$con = new Mongo("mongodb://{$username}:{$password}@{$host}");
Also try to connect to the database using the mongo shell interface.
I had this issue when trying to connect to ObjectRocket. The solution was to add my IP to the ACLs and then I no longer got this error.