title: Error on Zend_Session::namespaceUnset('Default');
body: <p>I'm fairly new to Zend and I think this question won't be so hard to answer.</p>
  
  <p>I'd like to unset my entire session namespace (called 'Default'), and I've found a possible answer <a href="https://stackoverflow.com/questions/8053461/how-to-destroy-zend-session-namespace-with-session-destroy">here</a>, but when I use the following line of code <code>Zend_Session::namespaceUnset('Default');</code> I get this error: <code>Zend_Session is currently marked as read-only.</code></p>
  
  <p>Hopefully someone can help me out.</p>