symfony assetic get 500 error for js file

Question

This just started on production. The file javascript file is there but gives a 500 error, with no other information.

500 Internal\u0020Server\u0020Error

running

bin/console assetic:dump --env=prod

shows the compiled file.

config part looks like this:

assetic:
    debug:          "%kernel.debug%"
    use_controller: true
    bundles:        [appBundle]
    filters:
        uglifyjs2:
            # the path to the uglifyjs executable
            bin: /usr/bin/uglifyjs
        uglifycss:
            bin: /usr/bin/uglifycss
        #cssrewrite:
           # apply_to: "\.css$"
   # java: /usr/bin/java

template reference -

<!-- include javascripts --->
{% javascripts '@appBundle/Resources/public/js/*' filter='uglifyjs2' %}
<script src="{{ asset_url }}"></script>
{% endjavascripts %}

htaccess file -

<IfModule mod_rewrite.c>
    Options +FollowSymlinks
    RewriteEngine On
    RewriteRule ^livemusic/web/app.php - [L]
  RewriteCond %{REQUEST_FILENAME} !-f
    RewriteRule ^(.*)$ livemusic/web/app.php [QSA,L]
   RewriteRule ^\robots.txt [L]  
</IfModule>