I am getting the same error. I checked github, but I don't see the solution. I am looking at master branch. The bug is in RestClient.php, line 93. Instead of : if ((isset($body[0]) && array_key_exists('error_key', $body[0])) || ($response['error'] !== FALSE)) { it should be : if ((isset($body[0]) && array_key_exists('error_key', $body[0])) || ($response['error'] !== '')) {
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