javascript error, behavior/general.js

Question

have the following error accusing in browser developer mode

Uncaught TypeError: undefined is not a function general.js:1549
init general.js:1549
(anonymous function) login:542
c jquery.js:4
p.fireWith jquery.js:4
x.extend.ready jquery.js:4
q

I found nothing to help me and my application behaves strangely.

Updating

code in haml of the page

%a{:href => "http://www.site.com.br"} © 2014 empresa
%script{:src => "js/jquery.js"}
%script{:src => "js/behaviour/general.js", :type => "text/javascript"}

function in file . js which error points:

if(config.select2){
    $(".select2").select2({
        width: '100%'
    });
}