exporting sales error - an item with the same key has already been added

Hi I am trying to export item sales and keep getting the following message

Application Version: 2021.1.24.2833
Application File Version: 2021.1.24.3611
Incident Id: 51ce0a4c-cfb6-473c-81d5-0bb1a16dc48e
Time: Thursday, 22 April 2021 2:15:32 PM

Code:
System.ArgumentException

Message:
An item with the same key has already been added.

Stack Trace
----------------------------------------
1 : System.ArgumentException
----------------------------------------
System.ArgumentException: An item with the same key has already been added.
at mscorlib!0x0600572c!System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) +0x27
at mscorlib!0x06005737!System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) +0x1b3
at Huxley.Service.Gateway!0x060019a9!MYOB.Huxley.Service.Gateway.API.IGatewayService.Dispatch(String name, Object[] arguments)
at Huxley.Service.Proxy!0x0600186d!MYOB.Huxley.Service.Proxy.Services.ProxySalePresentationExportService.GetItems(Object[] criterias) +0x0
at Huxley.ApplicationServices!0x06000448!MYOB.Huxley.ApplicationServices.ImportExport.Export.ExportService`2.GetItems(Object[] criterias) +0x0
at Huxley.ApplicationServices!0x0600043e!MYOB.Huxley.ApplicationServices.ImportExport.Export.ExportService`2.ExportData(String dataFormat, IEnumerable`1 mappings, Object[] parameters, Object[] criterias, String filename, IList`1 fields) +0x14
at Huxley.Services!0x06001483!MYOB.Huxley.Services.Core.ImportExport.ImportExportHelperService.ExportFile(ImportExportSubTypes type, String filename, String format, Boolean firstLineIsHeader, IList`1 fields, IExportCriteria expCriterias) +0x340
at Huxley.UI.Decorators!0x06001148!MYOB.Huxley.UI.Decorators.Services.DecoratorServiceMYOBHuxleyAPIServicesHelpersImportExportServiceIImportExportHelperService.MYOB.Huxley.API.Services.Helpers.ImportExportService.IImportExportHelperService.ExportFile(ImportExportSubTypes type, String filename, String format, Boolean firstLineIsHeader, IList`1 exportFields, IExportCriteria exportCriteria) +0x60
at Huxley.UI.Controllers!0x0600247e!MYOB.Huxley.UI.Controllers.ImportExport.ImportExportController.ExportFile() +0xa8
at Huxley.UI.Forms!0x06001ac8!MYOB.Huxley.UI.Forms.ImportExportWizard.ExportEntityProgress.PerformExport(IEnumerable`1 objects) +0x17
at Huxley.UI.Forms!0x06002f84!MYOB.Huxley.UI.Forms.BaseForms.BaseViewContainer.PerformAction(MethodToExecute methodToPerform, IEnumerable`1 uiEntities) +0x1c
at Huxley.UI.Forms!0x06001ac9!MYOB.Huxley.UI.Forms.ImportExportWizard.ExportEntityProgress.DoExport() +0x12
at mscorlib!0x06003bff!System.Threading.ThreadHelper.ThreadStart_Context(Object state) +0x14
at mscorlib!0x06003af0!System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) +0x79
at mscorlib!0x06003aef!System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) +0x0
at mscorlib!0x06003aee!System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) +0x2b
at mscorlib!0x06003c01!System.Threading.ThreadHelper.ThreadStart() +0x8
==========
MODULE: Huxley.ApplicationServices => Huxley.ApplicationServices, Version=2021.1.24.2833, Culture=neutral, PublicKeyToken=947f70fecdd4159f; G:2eaf2a0cde244208a6046b37319e5fd9; A:1
MODULE: Huxley.Service.Gateway => Huxley.Service.Gateway, Version=2021.1.24.2833, Culture=neutral, PublicKeyToken=947f70fecdd4159f; G:8720a7f17eda4742836a8f1c1864c695; A:1
MODULE: Huxley.Service.Proxy => Huxley.Service.Proxy, Version=2021.1.24.2833, Culture=neutral, PublicKeyToken=947f70fecdd4159f; G:ee03375ba02a4573aa6024b7c4452be2; A:1
MODULE: Huxley.Services => Huxley.Services, Version=2021.1.24.2833, Culture=neutral, PublicKeyToken=947f70fecdd4159f; G:c6110a63951943b88c85e45fe2115055; A:1
MODULE: Huxley.UI.Controllers => Huxley.UI.Controllers, Version=2021.1.24.2833, Culture=neutral, PublicKeyToken=947f70fecdd4159f; G:714d7a7f13734ef9bbb18516b9a03bc8; A:1
MODULE: Huxley.UI.Decorators => Huxley.UI.Decorators, Version=2021.1.24.2833, Culture=neutral, PublicKeyToken=947f70fecdd4159f; G:d5cef41fe0a84bb9a6bf8fca319dc98f; A:1
MODULE: Huxley.UI.Forms => Huxley.UI.Forms, Version=2021.1.24.2833, Culture=neutral, PublicKeyToken=947f70fecdd4159f; G:b3756c286e8e409b9e25696185e65da5; A:1
MODULE: mscorlib => mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089; G:c5a45f9081474038bb8a2f1441c7a2d0; A:2

is anyone able to help or advise how i am to repair my file