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Hi Ellen, have you solved this issue yet? Looking at your code I can't tell what server you are trying to connect to. I use the more direct approach by loading straight from the Class. Here is my code for both sandbox and production (I control how I want to connect with a DB table entry of sandbox on or off:

if ($ringcentral_sandbox == 1) {
// Use sandbox Client
$sdk = new RingCentral\SDK\SDK($client_id, $client_secret, RingCentral\SDK\SDK::SERVER_SANDBOX);
} else {
// Use Production Client
$sdk = new RingCentral\SDK\SDK($client_id, $client_secret, RingCentral\SDK\SDK::SERVER_PRODUCTION);
}

This removes the need to have the server name typed in correctly. Not sure this is the culprit but it may make your code a little more streamlined.

Basically I'm just replacing the Server parameter with:

RingCentral\SDK\SDK::SERVER_SANDBOX

or

RingCentral\SDK\SDK::SERVER_PRODUCTION

I saw this discussion as well. I did the below and it is bool(true).

I even echo debug output from SDK.php and it works... although, it doesn't see the class SDK when I do get_declared_classes().

<?php

require('vendor/autoload.php');

var_dump(file_exists("vendor/autoload.php"));

Yes. I see vendor/ringcentral and all of the other files.

My script includes (variables below are defined)

require('vendor/autoload.php');

use RingCentral\SDK\SDK;

$rcsdk = new SDK($RINGCENTRAL_CLIENTID, $RINGCENTRAL_CLIENTSECRET, $RINGCENTRAL_SERVER);

and I actually echoed variables to the screen to make sure each file was included (as I executed from the Linux command line)... It does include SDK.php.

The error specified is on the line where it says "new SDK" ( figured I'd mention it).

Also... I noticed that the autoload_classmap.php file is basically empty. Unsure if this should be the case:

<?php
// autoload_classmap.php @generated by Composer
$vendorDir = dirname(dirname(__FILE__));
$baseDir = dirname($vendorDir);
return array(
);

Do you see the "/vendor/ringcentral/" folder under your project folder? Or check if that exists where you install SDK into.