Accounts-ui-bootstrap-dropdown error

Hello everybody!

I reading “Discover meteor”, and writing my first application.
I use this command “meteor add mrt:accounts-ui-bootstrap-dropdown”, after I see this error
"mrt_accounts-ui-bootstrap-dropdown.js?hash=8d6acd0…:555 Uncaught TypeError: Cannot read property ‘push’ of undefined" in browser console
How this change?
Thank you