Object reference not set to an instance of an object.
Anonymously Hosted DynamicMethods Assembly
   at lambda_method(Closure )    
   at IdeaBlade.Linq.LocalizingExpressionVisitor.ConstantizeExpression(Expression expression, Type type)    
   at IdeaBlade.Linq.LocalizingExpressionVisitor.MakeLocal(Expression e)    
   at IdeaBlade.Linq.LocalizingExpressionVisitor.VisitExpressionCore(Expression expr)    
   at IdeaBlade.Linq.ExpressionVisitor.VisitExpression(Expression expr)    
   at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()    
   at System.Linq.Buffer`1..ctor(IEnumerable`1 source)    
   at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)    
   at IdeaBlade.Linq.ExpressionVisitor.VisitExpressions(IEnumerable`1 expressions)    
   at IdeaBlade.Linq.ExpressionVisitor.VisitExpressionCore(Expression e)    
   at IdeaBlade.Linq.TransformExpressionVisitor.VisitExpressionCore(Expression expr)    
   at IdeaBlade.Linq.ExpressionVisitor.VisitExpression(Expression expr)    
   at IdeaBlade.Linq.ExpressionVisitor.VisitExpressionCore(Expression e)    
   at IdeaBlade.Linq.TransformExpressionVisitor.VisitExpressionCore(Expression expr)    
   at IdeaBlade.Linq.ExpressionVisitor.VisitExpression(Expression expr)    
   at IdeaBlade.Linq.ExpressionVisitor.VisitExpressionCore(Expression e)    
   at IdeaBlade.Linq.TransformExpressionVisitor.VisitExpressionCore(Expression expr)    
   at IdeaBlade.Linq.ExpressionVisitor.VisitExpression(Expression expr)    
   at IdeaBlade.Linq.ExpressionVisitor.VisitExpressionCore(Expression e)    
   at IdeaBlade.Linq.TransformExpressionVisitor.VisitExpressionCore(Expression expr)    
   at IdeaBlade.Linq.ExpressionVisitor.VisitExpression(Expression expr)    
   at IdeaBlade.Linq.ExpressionVisitor.VisitExpressionCore(Expression e)    
   at IdeaBlade.Linq.TransformExpressionVisitor.VisitExpressionCore(Expression expr)    
   at IdeaBlade.Linq.ExpressionVisitor.VisitExpression(Expression expr)    
   at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()    
   at System.Linq.Buffer`1..ctor(IEnumerable`1 source)    
   at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)    
   at IdeaBlade.Linq.ExpressionVisitor.VisitExpressions(IEnumerable`1 expressions)    
   at IdeaBlade.Linq.ExpressionVisitor.VisitExpressionCore(Expression e)    
   at IdeaBlade.Linq.TransformExpressionVisitor.VisitExpressionCore(Expression expr)    
   at IdeaBlade.Linq.ExpressionVisitor.VisitExpression(Expression expr)    
   at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()    
   at System.Linq.Buffer`1..ctor(IEnumerable`1 source)    
   at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)    
   at IdeaBlade.Linq.ExpressionVisitor.VisitExpressions(IEnumerable`1 expressions)    
   at IdeaBlade.Linq.ExpressionVisitor.VisitExpressionCore(Expression e)    
   at IdeaBlade.Linq.TransformExpressionVisitor.VisitExpressionCore(Expression expr)    
   at IdeaBlade.Linq.ExpressionVisitor.VisitExpression(Expression expr)    
   at IdeaBlade.Linq.LocalizingExpressionVisitor.Visit(Expression expr)    
   at IdeaBlade.EntityModel.ServerEntityQuery..ctor(EntityQuery query)    
   at IdeaBlade.EntityModel.EntityQuery`1.GetServerQuery()    
   at IdeaBlade.EntityModel.EntityQueryFinder.get_ServerQuery()    
   at IdeaBlade.EntityModel.EntityQueryFinder.Execute()    
   at IdeaBlade.EntityModel.EntityManager.ExecuteQueryCore(IEntityQuery query, Boolean isAsync)    
   at IdeaBlade.EntityModel.EntityManager.ExecuteQuery[T](IEntityQuery`1 query)    
   at IdeaBlade.EntityModel.EntityQuery`1.GetEnumerator()    
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)    
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)    
   at IDATT.Web.Services.MobileService.GetTripData(DateTime lastSyncOn) in C:\CodeWorkspace\idatt\Code\ServerSide\IDATT.Web.Services\Rest\MobileService.cs:line 457    
   at IDATT.Web.Services.MobileService.GetUserTrips(String userName) in C:\CodeWorkspace\idatt\Code\ServerSide\IDATT.Web.Services\Rest\MobileService.cs:line 231

 

This is query executed locally. Looks like this:

 

var mblTrips =
                this.ApplicationEntityManager.MBLTrips
                .Include("DSPTruck")
                .Include("DSPTrailer")
                .Include("MBLTripAttributes.SYSAttribute")
                .Include("MBLTripStops.LOCAddress.LOCCountry")
                .Include("MBLTripStops.LOCAddress.LOCTimeZone")
                .Include("MBLTripStops.MBLTripStopAttributes.SYSAttribute")
                .Where(t =>
                    (t.DriverKey.HasValue && t.UpdatedOn > lastSyncOn && t.DriverKey.Value.Equals(this.Driver.DriverKey))
                    ||
                    (!t.DriverKey.HasValue && t.MBLTripOffers.Any(to => to.UpdatedOn > lastSyncOn && to.DriverKey.Equals(this.Driver.DriverKey)))).OrderBy(t => t.TripId).ToList();

            foreach (var mblTrip in mblTrips)
            {

 

 

I have this exception about 10 times in my log in 10 hours and 20000 calls. What should I look for?

 

Also, same query produces another exception and I see this one once in a while however logging inner and actual exception doesn't make much difference as far as helping me understand what's actually wrong with it..

 

      An error occurred while reading from the store provider's data reader. See the inner exception for details.
         at IdeaBlade.EntityModel.EntityManager.HandleEntityServerException(Exception ex, Boolean tryToHandle, PersistenceOperation operation, Boolean throwOnError)    
         at IdeaBlade.EntityModel.EntityManager.ExecuteServerQuery(IEntityQuerySurrogate entityQuery)    
         at IdeaBlade.EntityModel.EntityManager.ExecuteFetch(IEntityFinder finder)    
         at IdeaBlade.EntityModel.EntityQueryFinder.Execute()    
         at IdeaBlade.EntityModel.EntityManager.ExecuteQueryCore(IEntityQuery query, Boolean isAsync)    
         at IdeaBlade.EntityModel.EntityManager.ExecuteQuery[T](IEntityQuery`1 query)    
         at IdeaBlade.EntityModel.EntityQuery`1.GetEnumerator()    
         at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)    
         at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)    
         at IDATT.Web.Services.MobileService.GetTripData(DateTime lastSyncOn) in C:\CodeWorkspace\idatt\Code\ServerSide\IDATT.Web.Services\Rest\MobileService.cs:line 457
         at IDATT.Web.Services.MobileService.GetUserTrips(String userName) in C:\CodeWorkspace\idatt\Code\ServerSide\IDATT.Web.Services\Rest\MobileService.cs:line 231
        
            at IdeaBlade.EntityModel.EntityServerProxy.CheckConnection(Exception e)    
            at IdeaBlade.EntityModel.EntityServerProxy.ExecFunc[T](Func`1 func, Boolean funcWillHandleException)    
            at IdeaBlade.EntityModel.EntityServerProxy.ExecuteOnServer[T](Func`1 func, Boolean funcWillHandleException)    
            at IdeaBlade.EntityModel.EntityManager.ExecuteServerQuery(IEntityQuerySurrogate entityQuery)

 

I can't see anything obvious from the stack trace and message. My first suggestion is to see if the debug log provides some clues there for the second error. The log might not be useful for the first error since it's a CacheOnly query.

For the first error, my suggestion is to see if you can narrow it down to certain data values. Probably put some kind of logging and trace messages that log what data are being passed to the .Where clause.

See  http://drc.ideablade.com/xwiki/bin/view/Documentation/log#HGeneratecustommessages - http://drc.ideablade.com/xwiki/bin/view/Documentation/log#HGeneratecustommessages

 

Can you elaborate on this? What do you mean by cache-only query?

 

It is executed on web server (not via Silverlight). But I'm hitting database.

 

It's in WCF service and each call get's new instance of EntityManager.

Since this is the case then the debug log should have some info as well.

 

Issue appeared when I pre-compiled views for EF along with other changes. Seems like removing those pre-compiled views fixed this random issues.