Test 1: authData.php Auth exception: Refresh token has expired Exception: curl_close(): 57 is not a valid cURL handle resource SDK HTTP Error at _https://platform.devtest.ringcentral.com/restapi/oauth/token Response text: Previous: curl_close(): 57 is not a valid cURL handle resource #0 phar:///home/tamilwjv/public_html/demo/ring/ringapi/ringcentral.phar/ringcentral/ringcentral-php/src/Platform/Platform.php(214): RingCentral\SDK\Http\Client->send(Object(RingCentral\Psr7\Request)) #1 phar:///home/tamilwjv/public_html/demo/ring/ringapi/ringcentral.phar/ringcentral/ringcentral-php/src/Platform/Platform.php(301): RingCentral\SDK\Platform\Platform->sendRequest(Object(RingCentral\Psr7\Request), Array) #2 phar:///home/tamilwjv/public_html/demo/ring/ringapi/ringcentral.phar/ringcentral/ringcentral-php/src/Platform/Platform.php(123): RingCentral\SDK\Platform\Platform->requestToken('/restapi/oauth/...', Array) #3 /home/tamilwjv/public_html/demo/ring/ringapi/demo/authData.php(43): RingCentral\SDK\Platform\Platform-