Hi, Courier 2.51.4 on 7.3.0 assembly: 1.0.5750.18157 Express license

I'm trying to use the NetworkShareProvider thus:

<repository name="Revisions" alias="revisions" type="NetworkShareProvider" visible="true">
        <path>C:\temp</path>
    </repository>

And I get a NullReferenceException when selecting the courier action in the UI:

System.NullReferenceException: Object reference not set to an instance of an object. at Umbraco.Courier.Core.Repository.LoadSettings(XmlNode settingsXml, ExecutionContext ctx) at Umbraco.Courier.Core.Repository.LoadSettings(XmlNode settingsXml, ExecutionContext ctx) at Umbraco.Courier.Core.Storage.RepositoryStorage.GetAll() at Umbraco.Courier.UI.Dialogs.CommitItem.OnInit(EventArgs e) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) 

I can't actually find the NetworkShareProvider implementation in either Umbraco.Courier.Providers.dll or Umbraco.Courier.RepositoryProviders using the VS Object Explorer.

Can you help?

thanks