My buttons copy, csv, excel and pdf don´t work. i don´t have error.

juankmilo91

i am instaling tabletools in my mvc, all is good but the buttons copy, csv, excel and pdf don´t work. but print is working good.
please somebody help me.
thanks

juankmilo91

my code is

$(document).ready(function () {
$('#example').DataTable({
dom: 'T<"clear">lfrtip'
});
});

i can see the buttons but don´t wokr