We have installed Contour via the Umbraco Pro section in Developer\packages\Umbraco Package repository on Umbraco 4.7.2. We are running ASP.NET 4.0 and IS 6.  We have purchased and installed a Courier Express licence. When we try to run Courier via a right click, we get the following error:

The given key was not present in the dictionary.

Error details

System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
at Umbraco.Courier.Core.ItemProvider.get_DatabasePersistence()
at Umbraco.Courier.ItemProviders.DocumentItemProvider.AvailableSystemItems(ItemIdentifier itemId) in c:\Program Files (x86)\teamcity\buildAgent\work\2d3247b08adc3338\Umbraco.Courier.Providers\ItemProviders\ContentItemProvider.cs:line 41
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)

Having enabled error logging, the following error appears in the Contour logs:

15/06/2012 11:03:15: Can't import provider 'Umbraco.Courier.Persistence.V4.NHibernate.NHibernateProvider' id: e0474ca8-e73b-11df-9492-0800200c9a66: FluentNHibernate.Cfg.FluentConfigurationException: An invalid or incomplete configuration was used while creating a SessionFactory. Check PotentialReasons collection, and InnerException for more detail.

 ---> System.ArgumentException: Keyword not supported: 'datalayer'.
   at System.Data.Common.DbConnectionOptions.ParseInternal(Hashtable parsetable, String connectionString, Boolean buildChain, Hashtable synonyms, Boolean firstKey)
   at System.Data.Common.DbConnectionOptions..ctor(String connectionString, Hashtable synonyms, Boolean useOdbcRules)
   at System.Data.SqlClient.SqlConnectionString..ctor(String connectionString)
   at System.Data.SqlClient.SqlConnectionFactory.CreateConnectionOptions(String connectionString, DbConnectionOptions previous)
   at System.Data.ProviderBase.DbConnectionFactory.GetConnectionPoolGroup(String connectionString, DbConnectionPoolGroupOptions poolOptions, DbConnectionOptions& userConnectionOptions)
   at System.Data.SqlClient.SqlConnection.ConnectionString_Set(String value)
   at System.Data.SqlClient.SqlConnection.set_ConnectionString(String value)
   at NHibernate.Connection.DriverConnectionProvider.GetConnection()
   at NHibernate.Tool.hbm2ddl.SuppliedConnectionProviderConnectionHelper.Prepare()
   at NHibernate.Tool.hbm2ddl.SchemaMetadataUpdater.GetReservedWords(Dialect dialect, IConnectionHelper connectionHelper)
   at NHibernate.Tool.hbm2ddl.SchemaMetadataUpdater.Update(ISessionFactory sessionFactory)
   at NHibernate.Impl.SessionFactoryImpl..ctor(Configuration cfg, IMapping mapping, Settings settings, EventListeners listeners)
   at NHibernate.Cfg.Configuration.BuildSessionFactory()
   at FluentNHibernate.Cfg.FluentConfiguration.BuildSessionFactory()
   --- End of inner exception stack trace ---
   at FluentNHibernate.Cfg.FluentConfiguration.BuildSessionFactory()
   at Umbraco.Courier.Persistence.V4.NHibernate.NHibernateProvider.GetMSSqlSessionFactory(String connectionString) in c:\Program Files (x86)\teamcity\buildAgent\work\2d3247b08adc3338\Umbraco.Courier.Persistence.NHibernate\NHibernate.cs:line 248
   at Umbraco.Courier.Persistence.V4.NHibernate.NHibernateProvider.CreateSessionFactory() in c:\Program Files (x86)\teamcity\buildAgent\work\2d3247b08adc3338\Umbraco.Courier.Persistence.NHibernate\NHibernate.cs:line 222
   at Umbraco.Courier.Persistence.V4.NHibernate.NHibernateProvider.onAppStart() in c:\Program Files (x86)\teamcity\buildAgent\work\2d3247b08adc3338\Umbraco.Courier.Persistence.NHibernate\NHibernate.cs:line 37
   at Umbraco.Courier.Core.ProviderCollection`1.™(IEnumerable`1 types)

Any ideas?