Collection Already Exists

[engr-ahsan]

I am trying to use mubsub in my nodejs application where a user will get notified if he receives a chat message. This is the partial code:

var client = mubsub('mongodb://'+configuration.mongoDBUrl);
var channelConnection = client.channel('connectionstreams');
var channelMessages = client.channel('messagestreams');
var channelSparkTeams = client.channel('sparkteamstreams');
var channelChatMsg = client.channel('chatmsgstreams');

client.on('error', console.error);
channelConnection.on('error', console.error);
channelMessages.on('error', console.error);
channelSparkTeams.on('error', console.error);
channelChatMsg.on('error', console.error);

// --------------- New Chat Message
channelChatMsg.on('document',function(msg){
	console.log('Document inserted ->' + msg);
	sockets_users.forEach(function(socketUser,i){

		socketUser.emit('chat_' + msg.user1_id + "_" + msg.user2_id, msg);
		socketUser.emit('chat_' + msg.user2_id + "_" + msg.user1_id, msg);
		socketUser.emit('chat_ping_' + msg.user2_id,msg);
	});
});

Upon starting the application. I get the Mongodb Error that these collections already exists.

 MongoError: a collection 'TestDB.messagestreams' already exists
    at toError (g:\xampp\htdocs\skyloop\skyloop_backend_v2\node_modules\mubsub\node_modules\mongodb\lib\mongodb\utils.js:110:11)
    at g:\xampp\htdocs\skyloop\skyloop_backend_v2\node_modules\mubsub\node_modules\mongodb\lib\mongodb\utils.js:157:55
    at g:\xampp\htdocs\skyloop\skyloop_backend_v2\node_modules\mubsub\node_modules\mongodb\lib\mongodb\db.js:1806:9
    at Server.Base._callHandler (g:\xampp\htdocs\skyloop\skyloop_backend_v2\node_modules\mubsub\node_modules\mongodb\lib\mongodb\connection\base.js:442:41)
    at g:\xampp\htdocs\skyloop\skyloop_backend_v2\node_modules\mubsub\node_modules\mongodb\lib\mongodb\connection\server.js:485:18
    at MongoReply.parseBody (g:\xampp\htdocs\skyloop\skyloop_backend_v2\node_modules\mubsub\node_modules\mongodb\lib\mongodb\responses\mongo_reply.js:68:5)
    at .<anonymous> (g:\xampp\htdocs\skyloop\skyloop_backend_v2\node_modules\mubsub\node_modules\mongodb\lib\mongodb\connection\server.js:443:20)
    at emitOne (events.js:96:13)
    at emit (events.js:188:7)
    at .<anonymous> (g:\xampp\htdocs\skyloop\skyloop_backend_v2\node_modules\mubsub\node_modules\mongodb\lib\mongodb\connection\connection_pool.js:191:13)
  name: 'MongoError',
  note: 'the autoIndexId option is deprecated and will be removed in a future release',
  ok: 0,
  errmsg: 'a collection \'TestDB.messagestreams\' already exists',
  code: 48,
  codeName: 'NamespaceExists' }

Even though i removed them manullay at first. Upon restarting the application I am still getting the error
How do I resolve this error ???