use error template

lib/base.php

@@ -324,10 +324,16 @@ class OC {
 		if (session_start() === false){
 			OC_Log::write('core', 'Session could not be initialized', 
 				OC_Log::ERROR);
-			echo 'Session could not be initialized. Please contact your system';
-			echo ' administrator';
+			
 			header('HTTP/1.1 500 Internal Server Error');
-			exit(1);
+			$error = 'Session could not be initialized. Please contact your ';
+			$error .= 'system administrator';
+
+			$tmpl = new OC_Template('', 'error', 'guest');
+			$tmpl->assign('errors', array(1 => array('error' => $error)));
+			$tmpl->printPage();
+
+			exit();
 		}
 
 		// regenerate session id periodically to avoid session fixation