Macbook and MongoDB - mongodb

Question

I'm using mongoDB for an application following a tutorial here you have the link. While installing mongodb, I'm stuck at 9:50 and the command run to start mongod is mongod --directoryperdb --dbpath c:\mongodb\data\db --logpath c:\mongodb\log\mongo.log --logappend -rest --install
On my Mac I have my project and mongo directory on my desktop so I installed mongod following the above video. While starting mongod pointing to a different data directory using mongod --directoryperdb --dbpath /Usr/me/Desktop/mongodb/data/db --logpath /Usr/me/Desktop/mongodb/log/mongo.log --logappend -rest --install am having issues.
and it doesn't work (I have also copied the bin files to my local/bin directory
Below is the error.
events.js:160
throw er; // Unhandled 'error' event
^
MongoError: failed to connect to server [localhost:27017] on first connect [MongoError: connect ECONNREFUSED 127.0.0.1:27017]
at Pool.<anonymous> (/Users/houssamtoulni/Desktop/proget/node_modules/mongodb-core/lib/topologies/server.js:328:35)
at emitOne (events.js:96:13)
at Pool.emit (events.js:188:7)
at Connection.<anonymous> (/Users/houssamtoulni/Desktop/proget/node_modules/mongodb-core/lib/connection/pool.js:280:12)
at Connection.g (events.js:292:16)
at emitTwo (events.js:106:13)
at Connection.emit (events.js:191:7)
at Socket.<anonymous> (/Users/houssamtoulni/Desktop/proget/node_modules/mongodb-core/lib/connection/connection.js:177:49)
at Socket.g (events.js:292:16)
at emitOne (events.js:96:13)
at Socket.emit (events.js:188:7)
at emitErrorNT (net.js:1277:8)
at _combinedTickCallback (internal/process/next_tick.js:80:11)
at process._tickCallback (internal/process/next_tick.js:104:9)