sometimes javascript run perfect and sometimes not in ruby on rails 4 -

i used datepicker in calendar shows perfect not shows arrow button change month. , give error this:

actioncontroller::routingerror (no route matches [get] "/assets/images/ui-icons_ef8c08_256x240.png") 

datepicker.js

$(document).ready(function(){   $('[data-behaviour~=datepicker]').datepicker(); }); 

css link

sorry long question , tell me if miss something.

big in advance

edit: observed when delete public/assets directory , enter rake assets:precompile time error not showing arrow still not showing.

it looks turbolinks problem added rails 4 default. in turbolinks $(document).ready not firing. can see more information turbolinks , suggestions how use them here railscast or can add links

data: { no_turbolink: true } 

you can remove turbolinks gemfile if don't need them. check if have ui-icons_ef8c08_256x240.png in

/assets/images/