ruby on rails - Uncaught TypeError: $(...).datepicker is not a function - Bootstrap datepicker -

frustrating error. not readily discern answer stack overflow hence resorting posting question. appreciated.

i"m getting error:

uncaught typeerror: $(...).datepicker not function 

1. rails 4.2.4
2. ruby 2.1.2p95 (2014-05-08 revision 45877) [x86_64-linux]

gemfile:

gem 'ransack'  gem 'bootstrap-sass', '~> 3.2.0' gem 'autoprefixer-rails'  gem 'momentjs-rails', '>= 2.9.0' gem 'bootstrap3-datetimepicker-rails', '~> 4.14.30' 

my application.js file:

//= require jquery //= require jquery.turbolinks //= require jquery_ujs //= require datatables/jquery.datatables //= require turbolinks //= require jquery-ui/autocomplete //= require autocomplete-rails //= require bootstrap-sprockets //= require moment //= require bootstrap-datetimepicker //= require_tree . 

my application.css.sass file:

@import "bootstrap-sprockets" @import "bootstrap" @import 'bootstrap-datetimepicker' 

this how selecting date picker (within document ready):

$('#date-form-control1').datepicker({format: 'yyyy-mm-dd'}); 

this form:

 <div class="field">     <%= f.label :invoice_invoice_date_gteq, "date: greater than:" %>     <%= f.text_field  :invoice_invoice_date_gteq, id: "date-form-control1", placeholder: "date >= to" %>   </div> 

any advice appreciated.

you can't call datetimepicker datepicker({mindate})

use $('#date-form-control1').datetimepicker();

if want use date use datepicker