title: move redmine database to another instance
body: <p>I have redmine 2.5.3 installed on a virtual machine ( <a href="http://martin-denizet.com/install-redmine-2-5-x-git-subversion-ubuntu-14-04-apache2-rvm-passenger/" rel="nofollow">See Martin Denizet blog for HowTo install it</a> )
  Now, I want to move previous redmine DB (version 1.3) to this virtual machine.
  Both of redmine versions are in working , but virtual machine is not in production environment yet.</p>
  
  <p>I have tried changing the $REDMINE/config/database.yml to the production env, but I got "Internal server error" after refreshing the 2.5.3 main page.</p>
  
  <p>How this is possible?</p>