title: Symfony 4 - An error occurred while loading the web debug toolbar
body: <p>I'm working under Linux Mint (based on Ubuntu 18.04), apache2 and php 7.2</p>
  
  <p>When I generate a Symfony 3 project the toolbar is generated but with Symfony 4.2.5 the debugging toolbar does not show even with a fersh install.</p>
  
  <p>I tried this solutions:</p>
  
  <pre><code>composer require symfony/apache-pack
  chmod -R 777 var/cache
  </code></pre>
  
  <p>and</p>
  
  <pre><code>[sudo] a2enmod rewrite
  [sudo] service apache2 restart
  </code></pre>
  
  <p>And changed my .htaccess :</p>
  
  <pre><code>DirectoryIndex index.php
  
  &lt;IfModule mod_negotiation.c&gt;
      Options -MultiViews
  &lt;/IfModule&gt;
  
  &lt;IfModule mod_rewrite.c&gt;
      RewriteEngine On
  
      RewriteCond %{REQUEST_URI}::$1 ^(/.+)/(.*)::\2$
      RewriteRule ^(.*) - [E=BASE:%1]
  
      RewriteCond %{HTTP:Authorization} .
      RewriteRule ^ - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]
  
      RewriteCond %{ENV:REDIRECT_STATUS} ^$
      RewriteRule ^index\.php(?:/(.*)|$) %{ENV:BASE}/$1 [R=301,L]
  
      RewriteCond %{REQUEST_FILENAME} -f
      RewriteRule ^ - [L]
  
      RewriteRule ^ %{ENV:BASE}/index.php [L]
  &lt;/IfModule&gt;
  
  &lt;IfModule !mod_rewrite.c&gt;
      &lt;IfModule mod_alias.c&gt;
          RedirectMatch 307 ^/$ /index.php/
      &lt;/IfModule&gt;
  &lt;/IfModule&gt;
  </code></pre>
  
  <p>But I still got the same message for the toolbar with this message at the end of the page:</p>
  
  <blockquote>
    <p>An error occurred while loading the web debug toolbar.</p>
  </blockquote>