We are unable to publish using courier after upgrading from Courier 2.51.5 to 3.0.8.

Error form error log: 2017-04-18 15:44:27,978 [17] ERROR Umbraco.Courier.Core.TaskManager - [Thread 17] Error PackagingTask with id: 913945a4-ebd3-4f55-b6c0-1190991aa15b System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> No User exists with ID -1 at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall) at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters) at Umbraco.Courier.RepositoryProviders.WebServiceProvider.RepositoryWebservice.CloseSession(String sessionKey) at Umbraco.Courier.RepositoryProviders.CourierWebserviceRepositoryProvider.CloseSession(String sessionKey) at Umbraco.Courier.RepositoryProviders.CourierWebserviceRepositoryProvider.Dispose(Boolean disposing) at Umbraco.Courier.RepositoryProviders.CourierWebserviceRepositoryProvider.Dispose() at Umbraco.Courier.Core.Common.Extensions.GlobalExtensions.DisposeIfDisposable(Object input) at Umbraco.Courier.Core.Repository.Dispose(Boolean disposing) at Umbraco.Courier.Core.Repository.Dispose() at Umbraco.Courier.Core.Tasks.PackagingTask.Dispose() at Umbraco.Courier.Core.BackgroundTaskRunner`1.ConsumeTaskInternal(T task)