i am delete product from walmart by function $client->retire(['sku' => 'my sku']) got error

[affan169]

An uncaught Exception was encountered
Type: GuzzleHttp\Command\Exception\CommandServerException

Message: Error executing command: Server error response [url] https://marketplace.walmartapis.com/v2/items/MTW8-MW [status code] 500 [reason phrase] Internal Server Error

Filename: D:\wamp\www\amazon\vendo\guzzlehttp\command\src\AbstractClient.php

Line Number: 171

Backtrace:

File: D:\wamp\www\amazon\vendo\guzzlehttp\command\src\AbstractClient.php
Line: 253
Function: createCommandException

File: D:\wamp\www\amazon\vendo\guzzlehttp\guzzle\src\Event\Emitter.php
Line: 108
Function: GuzzleHttp\Command{closure}

File: D:\wamp\www\amazon\vendo\guzzlehttp\guzzle\src\RequestFsm.php
Line: 140
Function: emit

File: D:\wamp\www\amazon\vendo\guzzlehttp\guzzle\src\RequestFsm.php
Line: 132
Function: __invoke

File: D:\wamp\www\amazon\vendo\react\promise\src\FulfilledPromise.php
Line: 25
Function: GuzzleHttp{closure}

File: D:\wamp\www\amazon\vendo\guzzlehttp\ringphp\src\Future\CompletedFutureValue.php
Line: 55
Function: then

File: D:\wamp\www\amazon\vendo\guzzlehttp\guzzle\src\Message\FutureResponse.php
Line: 43
Function: then

File: D:\wamp\www\amazon\vendo\guzzlehttp\guzzle\src\RequestFsm.php
Line: 135
Function: proxy

File: D:\wamp\www\amazon\vendo\guzzlehttp\guzzle\src\Client.php
Line: 165
Function: __invoke

File: D:\wamp\www\amazon\vendo\guzzlehttp\command\src\AbstractClient.php
Line: 88
Function: send

File: D:\wamp\www\amazon\vendo\guzzlehttp\command\src\AbstractClient.php
Line: 76
Function: execute

File: D:\wamp\www\amazon\application\controllers\User.php
Line: 578
Function: __call

File: D:\wamp\www\amazon\application\controllers\User.php
Line: 578
Function: retire

File: D:\wamp\www\amazon\index.php
Line: 316
Function: require_once

for some time its run completely fine . please help thanks in advance .