title: phonon backend plugin cannot be loaded
body: <p>I am getting the following error when I run my music player program...</p>
  
  <pre><code>WARNING: bool Phonon::FactoryPrivate::createBackend() phonon backend plugin could not be loaded 
  WARNING: bool Phonon::FactoryPrivate::createBackend() phonon backend plugin could not be loaded 
  WARNING: bool Phonon::FactoryPrivate::createBackend() phonon backend plugin could not be loaded 
  The program has unexpectedly finished.
  </code></pre>
  
  <p>I am using the phonon library in qt creator. If required, the OS is ubuntu 12.04.
  What is the error?</p>