My file structure looks like this:
—public(Documentroot folder, where all my css,js, images loads from)
—models
—modules {all my modules customer, db_management e.t.c)
—scripts
|—ivr_builder
|------ui-bootstrap-tpls-0.2.js
–twig_templates {All my ta}
|—layout.twig
In my index.php file, I have this:
use \Psr\Http\Message\ServerRequestInterface as Request;
    use \Psr\Http\Message\ResponseInterface as Response;
    require '../vendor/autoload.php';
    spl_autoload_register(function ($classname) {
        require "../models/" . $classname . ".php";
    });
    $config['displayErrorDetails'] = false;
    $app = new \Slim\App(["settings" => $config]);
    $container = $app->getContainer();
    // Register component on container
    $container['view'] = function ($container) {
        $view = new \Slim\Views\Twig(
           '/var/www/html/ivr/twig_templates', ['cache' => false]);
        $env = $view->getEnvironment();
            $lexer = new Twig_Lexer($env, array(
            'tag_comment'   => array('{#', '#}'),
            'tag_block'     => array('{%', '%}'),
            'tag_variable'  => array('[[', ']]'),
            'interpolation' => array('#{', '}'),
        ));
        $env->setLexer($lexer);
       $loader = new \ Twig_Loader_Filesystem('ivr/scripts/ivr_builder/ui-bootstrap-tpls-0.13.4.js');
       $env->getLoader();
        return $view;
    };
Then in my browser, I get this error:
Name Status angular-aside.js 200 jquery.js 200 ui-bootstrap-tpls-0.1.3.4.js 500 
My layout.swig header looks like this:
<meta http-equiv="Content-Type" content="text/html" charset="iso-8859-1">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
{% if page_title is defined and page_title is not null ? page_title: 'Log in'  %}
{% endif %}
<link rel='stylesheet' href='/css/bootstrap.css'/>
<link rel='stylesheet' href='/js/libraries/angular-aside/angular-aside.css'/>
<link rel="stylesheet" href="/js/libraries/angular-notify-master/styles/css/angular-notify-texture.css" id="notifyTheme">
<link rel='stylesheet' href='/css/ivr_builder.css'/>
<link rel="stylesheet" type="text/css" href="/css/custom.css">
 <script type="application/javascript" src="/js/libraries/angular.js"></script>
<script type="application/javascript" src="/js/libraries/angular-animate.min.js"></script>
<script type="application/javascript" src="/scripts/ivr_builder/ui-bootstrap-tpls-0.13.4.js"></script>
<script type="application/javascript" src="/js/libraries/angular-aside/angular-aside.js"></script>
<script type="application/javascript" src="/js/libraries/angular-notify-master/scripts/dist/angular-notify.js"></script>
<script type="application/javascript" src="/js/jquery-ui-1.11.4/external/jquery/jquery.js"></script>
[[top_bar]]
Please any suggestion on how why its not loading please on the browser.

