Uncaught SyntaxError: Unexpected identifier

[cube4d]

Hi,

i just followed the install instruction => https://github.com/FriendsOfSymfony/FOSJsRoutingBundle/blob/master/Resources/doc/installation.rst

but i get the javscript error: Uncaught SyntaxError: Unexpected identifier for the line:

import Routing from '../../vendor/friendsofsymfony/jsrouting-bundle/Resources/public/js/router.min.js';

is this a common problem ?

Thank you