When you create a new campaign letter, and select campaignletter as the template, it creates the node but when you click on it I get this error:

Server Error in '/' Application.


            
 could not resolve property: campaign of: uWebZone.CampaignLetters.Entity.uwz_MasterTemplate 

            

             Description: An unhandled exception occurred during 
the execution of the current web request. Please review the stack trace 
for more information about the error and where it originated in the 
code.

            



             Exception Details: NHibernate.QueryException: could not resolve property: campaign of: uWebZone.CampaignLetters.Entity.uwz_MasterTemplate



            Source Error: 



            

               

                  

                      

An unhandled exception was generated during the execution of the current
 web request. Information regarding the origin and location of the 
exception can be identified using the exception stack trace below.

                  
               
            

            


            Stack Trace: 



            

               

                  

                      
[QueryException: could not resolve property: campaign of: uWebZone.CampaignLetters.Entity.uwz_MasterTemplate]
   NHibernate.Persister.Entity.AbstractPropertyMapping.ToType(String propertyName) +70
   NHibernate.Persister.Entity.AbstractEntityPersister.GetSubclassPropertyTableNumber(String propertyPath) +34
   NHibernate.Persister.Entity.BasicEntityPropertyMapping.ToColumns(String alias, String propertyName) +25
   NHibernate.Persister.Entity.AbstractEntityPersister.ToColumns(String alias, String propertyName) +21
   NHibernate.Loader.Criteria.CriteriaQueryTranslator.GetColumns(ICriteria subcriteria, String propertyName) +76
   NHibernate.Loader.Criteria.CriteriaQueryTranslator.GetColumnsUsingProjection(ICriteria subcriteria, String propertyName) +95
   NHibernate.Criterion.CriterionUtil.GetColumnNamesUsingPropertyName(ICriteriaQuery criteriaQuery, ICriteria criteria, String propertyName) +12
   NHibernate.Criterion.PropertyExpression.ToSqlString(ICriteria criteria, ICriteriaQuery criteriaQuery, IDictionary`2 enabledFilters) +75
   NHibernate.Loader.Criteria.CriteriaQueryTranslator.GetWhereCondition(IDictionary`2 enabledFilters) +249
   NHibernate.Loader.Criteria.CriteriaJoinWalker..ctor(IOuterJoinLoadable persister, CriteriaQueryTranslator translator, ISessionFactoryImplementor factory, ICriteria criteria, String rootEntityName, IDictionary`2 enabledFilters) +333
   NHibernate.Loader.Criteria.CriteriaLoader..ctor(IOuterJoinLoadable persister, ISessionFactoryImplementor factory, CriteriaImpl rootCriteria, String rootEntityName, IDictionary`2 enabledFilters) +195
   NHibernate.Impl.SessionImpl.List(CriteriaImpl criteria, IList results) +408
   NHibernate.Impl.CriteriaImpl.List(IList results) +56
   NHibernate.Impl.CriteriaImpl.UniqueResult() +47
   NHibernate.Criterion.QueryOver`1.SingleOrDefault() +50
   NHibernate.Criterion.QueryOver`1.NHibernate.IQueryOver<TRoot>.SingleOrDefault() +5
   uWebZone.CampaignLetters.Services.EmailBodyRender.PlaceHolderNameList(Guid campaignUniqueID) +1537
   uWebZone.CampaignLetters.Pages.Letters.<initialData>b__8(DropDownList d) +87
   uWebZone.CampaignLetters.UserControls.TabView.Execute(String id, Action`1 action) +205
   uWebZone.CampaignLetters.Pages.Letters.initialData() +360
   uWebZone.CampaignLetters.Pages.Letters.Page_Load(Object sender, EventArgs e) +254
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
   System.Web.UI.Control.OnLoad(EventArgs e) +91
   System.Web.UI.Control.LoadRecursive() +74
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2207