sspmod_saml_Message::getResponseError PHP Method

    public static function getResponseError(\SAML2\StatusResponse $response)
    {
        $status = $response->getStatus();
        return new sspmod_saml_Error($status['Code'], $status['SubCode'], $status['Message']);
    }

$metadata = SimpleSAML_Metadata_MetaDataStorageHandler::getMetadataHandler();
$idpMetadata = $source->getIdPMetadata($idpEntityId);
$spMetadata = $source->getMetadata();
sspmod_saml_Message::validateMessage($idpMetadata, $spMetadata, $message);
$destination = $message->getDestination();
//if ($destination !== NULL && $destination !== SimpleSAML_Utilities::selfURLNoQuery()) {
//	throw new SimpleSAML_Error_Exception('Destination in logout message is wrong.');
//}
if ($message instanceof SAML2_LogoutResponse) {
    $relayState = $message->getRelayState();
    if ($relayState === NULL) {
        /* Somehow, our RelayState has been lost. */
        throw new SimpleSAML_Error_BadRequest('Missing RelayState in logout response.');
    }
    if (!$message->isSuccess()) {
        SimpleSAML_Logger::warning('Unsuccessful logout. Status was: ' . sspmod_saml_Message::getResponseError($message));
    }
    $state = SimpleSAML_Auth_State::loadState($relayState, 'saml:slosent');
    SimpleSAML_Auth_Source::completeLogout($state);
} elseif ($message instanceof SAML2_LogoutRequest) {
    SimpleSAML_Logger::debug('module/saml2/sp/logout: Request from ' . $idpEntityId);
    SimpleSAML_Logger::stats('saml20-idp-SLO idpinit ' . $spEntityId . ' ' . $idpEntityId);
    if ($message->isNameIdEncrypted()) {
        try {
            $keys = sspmod_saml_Message::getDecryptionKeys($srcMetadata, $dstMetadata);
        } catch (Exception $e) {
            throw new SimpleSAML_Error_Exception('Error decrypting NameID: ' . $e->getMessage());
        }
        $lastException = NULL;
        foreach ($keys as $i => $key) {
            try {