Sandbox createFulfillmentPolicy error

[be_987054]

{
  "errors": [
    {
      "errorId": 2003,
      "domain": "ACCESS",
      "category": "APPLICATION",
      "message": "Internal error",
      "longMessage": "There was a problem with an eBay internal system or process. Contact eBay developer support for assistance"
    }
  ]
}