TypeError: collection .find is not a function

Dear friends :

After upgrading to 1.4 I , i am getting the following error on a collection find() call. Has something changed which i am not aware of ?

models.js:
export const PricePosition = new Mongo.Collection(‘price_positions’);

Meteor.startup() {

//grab all records on startup
var last_run_position = PricePosition.find().fetch();
}

Error message produced :

W20170513-10:41:27.523(-7)? (STDERR) /Project1/.meteor/packages/meteor-tool/.1.4.4_2.1jsgocx++os.osx.x86_64+web.browser+web.cordova/mt-os.osx.x86_64/dev_bundle/server-lib/node_modules/fibers/future.js:280
W20170513-10:41:27.524(-7)? (STDERR) throw(ex);
W20170513-10:41:27.524(-7)? (STDERR) ^
W20170513-10:41:27.525(-7)? (STDERR)
W20170513-10:41:27.525(-7)? (STDERR) TypeError: _PricePosition.find is not a function
W20170513-10:41:27.525(-7)? (STDERR) at _Meteor.startup.is_auto (payaneh.js:74:47)
W20170513-10:41:27.525(-7)? (STDERR) at Function.time (/Project1/.meteor/local/build/programs/server/profile.js:309:28)
W20170513-10:41:27.525(-7)? (STDERR) at /Project1/.meteor/local/build/programs/server/boot.js:312:13
W20170513-10:41:27.526(-7)? (STDERR) at /Project1/.meteor/local/build/programs/server/boot.js:353:5
W20170513-10:41:27.526(-7)? (STDERR) at Function.run /Project1/.meteor/local/build/programs/server/profile.js:510:12)
W20170513-10:41:27.526(-7)? (STDERR) at /Project1/.meteor/local/build/programs/server/boot.js:351:11
=> Exited with code: 1
=> Your application is crashing. Waiting for file change.