Error 500 with BulkDataExchangeService

[ghost]

Hi,

I have to send tracking informations to ebay and found your sdk-examples.

I tried to test your example <04-set-shipment-tracking-info> but always get this error:

Guzzle\Http\Exception\ServerErrorResponseException: Server error response
[status code] 500
[reason phrase] Internal Server Error
[url] https://webservices.sandbox.ebay.com/BulkDataExchangeService in C:\Roesgen\Projects\PHPStorm\ebay-sdk-examples-master\vendor\guzzle\guzzle\src\Guzzle\Http\Exception\BadResponseException.php on line 43

The configuration should be fine, because <03-simple-keywords-search> works.

Do you have any idea?

Thanks for any help.
Frank