Yeah another problem. I cant create a revision because this stack trace pops up:

Umbraco.Courier.Core.Exceptions.PackageException: Unable to load item 
with id '-1' from provider 'Media' ---> 
Umbraco.Courier.Core.Exceptions.RetrieveException: Error retrieving item
 [-1] from provider [d8e6ad87-e73a-11df-9492-0800200c9a66]. ---> 
System.ArgumentOutOfRangeException: Length cannot be less than zero.
Parameter name: length
   at System.String.InternalSubStringWithChecks(Int32 startIndex, Int32 
length, Boolean fAlwaysCopy)
   at 
Umbraco.Courier.Persistence.V4.NHibernate.Helpers.MediaHelper.GetFromFileName(String
 filePath, ISession session) in c:\Program Files 
(x86)\teamcity\buildAgent\work\650bafc4b83aa858\Core\Umbraco.Courier.Persistence.NHibernate\Helpers\MediaHelper.cs:line
 0
   at 
Umbraco.Courier.Persistence.V4.NHibernate.Persisters.MediaItem.RetrieveItem[T](ItemIdentifier
 itemId) in c:\Program Files 
(x86)\teamcity\buildAgent\work\650bafc4b83aa858\Core\Umbraco.Courier.Persistence.NHibernate\Persisters\Media.cs:line
 72
   at 
Umbraco.Courier.Core.ItemCrudProvider.RetrieveItem[T](ItemIdentifier 
itemId)
   --- End of inner exception stack trace ---
   at 
Umbraco.Courier.Core.ItemCrudProvider.RetrieveItem[T](ItemIdentifier 
itemId)
   at 
Umbraco.Courier.ItemProviders.MediaItemProvider.HandlePack(ItemIdentifier
 id)
   at Umbraco.Courier.Core.ItemProvider.Package(ItemIdentifier id)
   at Umbraco.Courier.RepositoryProviders.Local.Package(ItemIdentifier 
itemId)
   at 
Umbraco.Courier.Core.Packaging.RevisionPackaging.PackageItem(ItemIdentifier
 itemId, ItemProvider provider, QueuedItemIdentifier itemInQueue)
   --- End of inner exception stack trace ---
   at 
Umbraco.Courier.Core.Packaging.RevisionPackaging.PackageItem(ItemIdentifier
 itemId, ItemProvider provider, QueuedItemIdentifier itemInQueue)
   at Umbraco.Courier.Core.Packaging.RevisionPackaging.PackageBatch()
   at Umbraco.Courier.Core.Packaging.RevisionPackaging.PackageBatch()
   at Umbraco.Courier.Core.Packaging.RevisionPackaging.PackageBatch()
   at Umbraco.Courier.Core.Packaging.RevisionPackaging.Package()
   at Umbraco.Courier.Core.Tasks.PackagingTask.Run()
   at Umbraco.Courier.Core.TaskManager.manageTask(IRevisionTask value)
 5/16/2013 2:40:26 PM

I looked though the database and i cant seem to find anything related to a media node with the id of -1, so i dont know how this could happen. Maybe i am not looking the right place. either way, i get this error everytime so courier is essentially useless right now.

I happens when i try to create a revision, and select a document, and all its dependencies. A revision is created with some files in it, but the receiving umbraco installation cant read it because it does not contain a comparison files, so the revision is not created correctly.

I am using courier 2.7.7.3 (umbraco v4 version), installed on a Umbraco 4.7.2 installation.