Tried Ember s and got error

I am a new Ember learner. I got the following error when I run command ember serve Could you please help?

ENOENT: no such file or directory, open ‘C:\myproject\tmp\source_map_concat-input_base_path-H8VzGZjE.tmp\bower_components\pdfmake\build\pdfmake.js’

What version of ember, and windows are you using? Which shell are you using?

Also, it looks like you may be missing a bower dependency, which makes it look like this is an older Ember app. Have you installed Bower and run bower install?