Notice: Use of undefined constant DS

[drwalidadly]

I installed "Improve my city"
when i Log into Joomla Dashboard , Hover over Components -> Improve my city -> Issue Categories
I receive the following error:

Notice: Use of undefined constant DS - assumed 'DS' in C:\xampp\htdocs\Joomla\administrator\components\com_improvemycity\improvemycity.php on line 20

Notice: Use of undefined constant DS - assumed 'DS' in C:\xampp\htdocs\Joomla\administrator\components\com_improvemycity\improvemycity.php on line 20

Fatal error: Call to undefined method JController::getInstance() in C:\xampp\htdocs\Joomla\administrator\components\com_improvemycity\improvemycity.php on line 25