Internal Server Error

[22278fe538c6382b4c4bcfb0] /mediawiki/api.php?action=feedcontributions&user=Rana&feedformat=atom DBConnectionError from line 748 of E:\xampp-1.8.3.4\htdocs\mediawiki\includes\libs\rdbms\database\Database.php: Cannot access the database: No connection could be made because the target machine actively refused it.
(localhost)
Backtrace:
#0 E:\xampp-1.8.3.4\htdocs\mediawiki\includes\libs\rdbms\loadbalancer\LoadBalancer.php(897): Database->reportConnectionError(string)
#1 E:\xampp-1.8.3.4\htdocs\mediawiki\includes\libs\rdbms\loadbalancer\LoadBalancer.php(572): LoadBalancer->reportConnectionError()
#2 E:\xampp-1.8.3.4\htdocs\mediawiki\includes\GlobalFunctions.php(3075): LoadBalancer->getConnection(integer, array, boolean)
#3 E:\xampp-1.8.3.4\htdocs\mediawiki\includes\cache\MessageCache.php(444): wfGetDB(integer)
#4 E:\xampp-1.8.3.4\htdocs\mediawiki\includes\cache\MessageCache.php(403): MessageCache->loadFromDB(string, NULL)
#5 E:\xampp-1.8.3.4\htdocs\mediawiki\includes\cache\MessageCache.php(325): MessageCache->loadFromDBWithLock(string, array, NULL)
#6 E:\xampp-1.8.3.4\htdocs\mediawiki\includes\cache\MessageCache.php(927): MessageCache->load(string)
#7 E:\xampp-1.8.3.4\htdocs\mediawiki\includes\cache\MessageCache.php(858): MessageCache->getMsgFromNamespace(string, string)
#8 E:\xampp-1.8.3.4\htdocs\mediawiki\includes\cache\MessageCache.php(826): MessageCache->getMessageForLang(Language, string, boolean, array)
#9 E:\xampp-1.8.3.4\htdocs\mediawiki\includes\cache\MessageCache.php(767): MessageCache->getMessageFromFallbackChain(Language, string, boolean)
#10 E:\xampp-1.8.3.4\htdocs\mediawiki\includes\Message.php(1188): MessageCache->get(string, boolean, Language)
#11 E:\xampp-1.8.3.4\htdocs\mediawiki\includes\Message.php(802): Message->fetchMessage()
#12 E:\xampp-1.8.3.4\htdocs\mediawiki\includes\Message.php(902): Message->toString()
#13 E:\xampp-1.8.3.4\htdocs\mediawiki\includes\OutputPage.php(942): Message->text()
#14 E:\xampp-1.8.3.4\htdocs\mediawiki\includes\api\ApiFormatBase.php(199): OutputPage->setPageTitle(Message)
#15 E:\xampp-1.8.3.4\htdocs\mediawiki\includes\api\ApiMain.php(1634): ApiFormatBase->closePrinter()
#16 E:\xampp-1.8.3.4\htdocs\mediawiki\includes\api\ApiMain.php(588): ApiMain->printResult(boolean)
#17 E:\xampp-1.8.3.4\htdocs\mediawiki\includes\api\ApiMain.php(518): ApiMain->handleException(DBConnectionError)
#18 E:\xampp-1.8.3.4\htdocs\mediawiki\includes\api\ApiMain.php(480): ApiMain->executeActionWithErrorHandling()
#19 E:\xampp-1.8.3.4\htdocs\mediawiki\api.php(83): ApiMain->execute()
#20 {main}