Error when running ember server: bower packages missing

Hi I am brand new to Ember . following a course in Plural-sight I was able to run cli and create new project after a lot of fighting. Then I tried ember server and I get error :missing bower packages : ember ,ember-shim There as also warning node v8.7.0 has not been tested against ...etc and unexpected results can happen...and a message like migrate-away-from-bower So how can troubleshoot this problem