title: How to show errors in Symfony2 application white page
body: <p>I am working in an web application and I got access to the files of the project. I am trying to run in local.</p>
  
  <p>I've downloaded all the source code and the vendor libraries. Then I tried to run the project by the console.</p>
  
  <p>It seems to work fine, but when I try to open the page in my browser it is just white.</p>
  
  <p>I don't even know how to start looking for an error. How can we look for bugs or errors in this case?</p>