I've a problem with my app engine while I'm trying to implement Google+ PHP API , it gives me a fatal error in curl file "Goolge_IO.php" it's one of the library files which was provided on https://code.google.com/p/google-api-php-client/
Here's the detailed error
Fatal error: Uncaught exception 'Exception' with message 'Google CurlIO client requires the CURL PHP extension' in C:\Users\joker\Desktop\\plus\src\io\Google_CurlIO.php:47 Stack trace: #0 C:\Users\joker\Desktop\plus\src\Google_Client.php(106): Google_CurlIO->__construct() #1 C:\Users\joker\Desktop\plus\index.php(22): Google_Client->__construct() #2 C:\Program Files (x86)\Google\google_appengine\google\appengine\tools\devappserver2\php\setup.php(100): require('C:\Users\joker\...') #3 {main} thrown in C:\Users\joker\Desktop\plus\src\io\Google_CurlIO.php on line 47