Meteor error - Storing tasks in a collection - mongodb

Question

I am following the meteor site tutorial (https://www.meteor.com/tutorials/blaze/collections).
But when you add the line:
export const Tasks = new Mongo.Collection('tasks');
I get the following error:
/Users/user/.meteor/packages/meteor-tool/.1.4.1_2.fpzmec++os.osx.x86_64+web.browser+web.cordova/mt-os.osx.x86_64/dev_bundle/server-lib/node_modules/fibers/future.js:313
throw(ex);
^
MongoError: failed to connect to server [localhost:27017] on first connect
at Object.Future.wait (/Users/user/.meteor/packages/meteor-tool/.1.4.1_2.fpzmec++os.osx.x86_64+web.browser+web.cordova/mt-os.osx.x86_64/dev_bundle/server-lib/node_modules/fibers/future.js:449:15)
at new MongoConnection (packages/mongo/mongo_driver.js:216:27)
at new MongoInternals.RemoteCollectionDriver (packages/mongo/remote_collection_driver.js:4:16)
at Object.<anonymous> (packages/mongo/remote_collection_driver.js:38:10)
at Object.defaultRemoteCollectionDriver (packages/underscore/underscore.js:750:1)
at new Mongo.Collection (packages/mongo/collection.js:103:40)
at meteorInstall.imports.api.tasks.js (imports/api/tasks.js:4:14)
at fileEvaluate (packages/modules-runtime/.npm/package/node_modules/install/install.js:153:1)
at Module.require (packages/modules-runtime/.npm/package/node_modules/install/install.js:82:1)
at Module.Mp.import (/Users/user/.meteor/packages/modules/.0.7.6_1.j54juu++os+web.browser+web.cordova/npm/node_modules/reify/lib/runtime.js:70:16)
- - - - -
at [object Object].<anonymous> (/Users/user/.meteor/packages/npm-mongo/.1.5.50.1g0yl8n++os+web.browser+web.cordova/npm/node_modules/mongodb-core/lib/topologies/server.js:313:35)
at emitOne (events.js:77:13)
at [object Object].emit (events.js:169:7)
at [object Object].<anonymous> (/Users/user/.meteor/packages/npm-mongo/.1.5.50.1g0yl8n++os+web.browser+web.cordova/npm/node_modules/mongodb-core/lib/connection/pool.js:260:12)
at [object Object].g (events.js:260:16)
at emitTwo (events.js:87:13)
at [object Object].emit (events.js:172:7)
at Socket.<anonymous> (/Users/user/.meteor/packages/npm-mongo/.1.5.50.1g0yl8n++os+web.browser+web.cordova/npm/node_modules/mongodb-core/lib/connection/connection.js:162:49)
at Socket.g (events.js:260:16)
at emitOne (events.js:77:13)
Exited with code: 1
Your application is crashing. Waiting for file change.

Answer 1

The line in the tutorial:
export const Tasks = new Mongo.Collection('tasks');
Is different from your line:
Export Tasks const = new Mongo.Collection ('tasks');
The goal of the code is to initialize a new constant, Tasks, set it to a new Mongo.Collection, and then export it.