/**
  * Constructs a new exception
  * @param zibo\admin\model\Module $module The module which is still needed by other modules
  * @param Exception $previousException
  * @return null
  */
 public function __construct(Module $module, Exception $previousException = null)
 {
     $usage = $module->getUsage();
     $usageString = '';
     foreach ($usage as $usedModule) {
         $usageString .= ($usageString ? ', ' : '') . $usedModule->getName() . ' from namespace ' . $usedModule->getNamespace();
     }
     $message = 'Could not remove ' . $module->getName() . ' from namespace ' . $module->getNamespace() . ': still used by ';
     parent::__construct($module, $message . $usageString, 0, $previousException);
 }