title: Odoo: Internal Server Error
body: <p>I've installed Odoo 9.0 on Ubuntu 14.04, and I've activated the developer mode to install module from App Store. Every app I try to install that doesn't belong to the 31 apps offered by default without accessing developer mode, I get this error:</p>
  
  <p>Internal Server Error</p>
  
  <p>The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.</p>
  
  <p>It looks like this happens only on the local installation. i tried to install the Barcode app in online trial, and I encoutered no problems.</p>
  
  <p>If anyone may help me, I'll be eternaly grateful.</p>