‘Administration’ page does not works and showed me this error
Fatal error: Uncaught GuzzleHttp\Exception\ConnectException: cURL error 6: Could not resolve host: pkp.sfu.ca; Unknown error (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) in /home/balidwi/ojs.balidwipa.ac.id/lib/pkp/lib/vendor/guzzlehttp/guzzle/src/Handler/CurlFactory.php:200 Stack trace: #0 /home/balidwi/ojs.balidwipa.ac.id/lib/pkp/lib/vendor/guzzlehttp/guzzle/src/Handler/CurlFactory.php(155): GuzzleHttp\Handler\CurlFactory::createRejection() #1 /home/balidwi/ojs.balidwipa.ac.id/lib/pkp/lib/vendor/guzzlehttp/guzzle/src/Handler/CurlFactory.php(105): GuzzleHttp\Handler\CurlFactory::finishError() #2 /home/balidwi/ojs.balidwipa.ac.id/lib/pkp/lib/vendor/guzzlehttp/guzzle/src/Handler/CurlHandler.php(43): GuzzleHttp\Handler\CurlFactory::finish() #3 /home/balidwi/ojs.balidwipa.ac.id/lib/pkp/lib/vendor/guzzlehttp/guzzle/src/Handler/Proxy.php(28): GuzzleHttp\Handler\CurlHandler->__invoke() #4 /home/balidwi/ojs.balidwipa.ac.id/lib/pkp/lib/vendor/guzzlehttp/guzzle/src/Handler/Proxy.php(51): GuzzleHttp\Handler\Proxy::GuzzleHttp\Handler\{closure}() #5 /home/balidwi/ojs.balidwipa.ac.id/lib/pkp/lib/vendor/guzzlehttp/guzzle/src/PrepareBodyMiddleware.php(37): GuzzleHttp\Handler\Proxy::GuzzleHttp\Handler\{closure}() #6 /home/balidwi/ojs.balidwipa.ac.id/lib/pkp/lib/vendor/guzzlehttp/guzzle/src/Middleware.php(29): GuzzleHttp\PrepareBodyMiddleware->__invoke() #7 /home/balidwi/ojs.balidwipa.ac.id/lib/pkp/lib/vendor/guzzlehttp/guzzle/src/RedirectMiddleware.php(70): GuzzleHttp\Middleware::GuzzleHttp\{closure}() #8 /home/balidwi/ojs.balidwipa.ac.id/lib/pkp/lib/vendor/guzzlehttp/guzzle/src/Middleware.php(59): GuzzleHttp\RedirectMiddleware->__invoke() #9 /home/balidwi/ojs.balidwipa.ac.id/lib/pkp/lib/vendor/guzzlehttp/guzzle/src/HandlerStack.php(71): GuzzleHttp\Middleware::GuzzleHttp\{closure}() #10 /home/balidwi/ojs.balidwipa.ac.id/lib/pkp/lib/vendor/guzzlehttp/guzzle/src/Client.php(351): GuzzleHttp\HandlerStack->__invoke() #11 /home/balidwi/ojs.balidwipa.ac.id/lib/pkp/lib/vendor/guzzlehttp/guzzle/src/Client.php(162): GuzzleHttp\Client->transfer() #12 /home/balidwi/ojs.balidwipa.ac.id/lib/pkp/lib/vendor/guzzlehttp/guzzle/src/Client.php(182): GuzzleHttp\Client->requestAsync() #13 /home/balidwi/ojs.balidwipa.ac.id/lib/pkp/classes/xml/PKPXMLParser.inc.php(113): GuzzleHttp\Client->request() #14 /home/balidwi/ojs.balidwipa.ac.id/lib/pkp/classes/xml/PKPXMLParser.inc.php(199): PKPXMLParser->_getStream() #15 /home/balidwi/ojs.balidwipa.ac.id/lib/pkp/classes/db/XMLDAO.inc.php(52): PKPXMLParser->parseStruct() #16 /home/balidwi/ojs.balidwipa.ac.id/lib/pkp/classes/site/VersionCheck.inc.php(76): XMLDAO->parseStruct() #17 /home/balidwi/ojs.balidwipa.ac.id/lib/pkp/classes/site/VersionCheck.inc.php(44): VersionCheck::parseVersionXML() #18 /home/balidwi/ojs.balidwipa.ac.id/lib/pkp/classes/site/VersionCheck.inc.php(175): VersionCheck::getLatestVersion() #19 /home/balidwi/ojs.balidwipa.ac.id/lib/pkp/pages/admin/AdminHandler.inc.php(98): VersionCheck::checkIfNewVersionExists() #20 /home/balidwi/ojs.balidwipa.ac.id/lib/pkp/classes/core/PKPRouter.inc.php(394): AdminHandler->initialize() #21 /home/balidwi/ojs.balidwipa.ac.id/lib/pkp/classes/core/PKPPageRouter.inc.php(246): PKPRouter->_authorizeInitializeAndCallRequest() #22 /home/balidwi/ojs.balidwipa.ac.id/lib/pkp/classes/core/Dispatcher.inc.php(144): PKPPageRouter->route() #23 /home/balidwi/ojs.balidwipa.ac.id/lib/pkp/classes/core/PKPApplication.inc.php(360): Dispatcher->dispatch() #24 /home/balidwi/ojs.balidwipa.ac.id/index.php(68): PKPApplication->execute() #25 {main} thrown in /home/balidwi/ojs.balidwipa.ac.id/lib/pkp/lib/vendor/guzzlehttp/guzzle/src/Handler/CurlFactory.php on line 200
this error also slows the website load time when users trying to access any article, i think its trying to access PKP API but it somehow fails
i am using OJS 3.3.0-16
i already did : clear cache, cookies, and browsing history