ExceptionMessage":"Object reference not set to an instance of an object" when creating order

[stickerNinja]

Hey there, I am extremely new to using APIs and I'm wondering if someone could provide me hints as to why I'm getting this error. Am I formatting something wrong? I will post my code as well as the error below. Thanks so much for your help!

Code: 

let orderBody={
    "orderNumber":"2507",
"orderDate":"2021-08-24T23:33:59.000Z",
 "orderStatus": "awaiting_shipment",
 "billTo": {
    "name": "The President",
    "company": null,
    "street1": null,
    "street2": null,
    "street3": null,
    "city": null,
    "state": null,
    "postalCode": null,
    "country": null,
    "phone": null,
    "residential": null
  },
"shipTo": {
    "name": "The President",
    "company": "US Govt",
    "street1": "1600 Pennsylvania Ave",
    "street2": "Oval Office",
    "street3": null,
    "city": "Washington",
    "state": "DC",
    "postalCode": "20500",
    "country": "US",
    "phone": "555-555-5555",
    "residential": true
  }
}

let response = await fetch('https://ssapi.shipstation.com/orders/createorder',
     {method: 'POST', 
     headers: {"Content-type": "application/json",
     Authorization:"*my authorization*"},
     body: JSON.stringify(orderBody)}
     
     
     );
console.log(await response.text());

Error:

"{"Message":"An error has occurred.","ExceptionMessage":"Object reference not set to an instance of an object.","ExceptionType":"System.NullReferenceException","StackTrace":" at SS.OpenApi.Controllers.OrdersController._CreateOrder(Order apiOrder, Guid ImportBatch, Boolean throwDuplicateException) in D:\\buildAgentFull\\work\\8e15a453e647e65a\\SS.OpenApi\\Controllers\\OrdersController.cs:line 1400\r\n at SS.OpenApi.Controllers.OrdersController.CreateOrder(Order apiOrder) in D:\\buildAgentFull\\work\\8e15a453e647e65a\\SS.OpenApi\\Controllers\\OrdersController.cs:line 982\r\n at lambda_method(Closure , Object , Object[] )\r\n at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass10.<GetExecutor>b__9(Object instance, Object[] methodParameters)\r\n at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__0.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Filters.ActionFilterAttribute.<CallOnActionExecutedAsync>d__5.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Web.Http.Filters.ActionFilterAttribute.<CallOnActionExecutedAsync>d__5.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Filters.ActionFilterAttribute.<ExecuteActionFilterAsyncCore>d__0.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__2.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Filters.AuthorizationFilterAttribute.<ExecuteAuthorizationFilterAsyncCore>d__2.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Controllers.ExceptionFilterResult.<ExecuteAsync>d__0.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Web.Http.Controllers.ExceptionFilterResult.<ExecuteAsync>d__0.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1.MoveNext()"}"

[SystemsLogic]

I have the same error message. Did you resolve this and if so, what was the resolution?