The collection has not been initialized. It has not been requested or the request has not been executed. It may need to be explicitly requested

hi sir,

I have try to update task assignments using csom model.

 erro message ::The collection has not been initialized. It has not been requested or the request has not been executed. It may need to be explicitly requested

 foreach (PublishedAssignment assignItem in item.Assignments)
                        {
                            Guid id =assignItem.Id;
                           cc.Load(assignItem, a => a.Resource,a=>a.PercentWorkComplete);
                           cc.ExecuteQuery();

                           EnterpriseResource er = cc.EnterpriseResources.GetByGuid(assignItem.Resource.Id);

                       
                         
                         
                           cc.Load(item.Assignments,c=>c.Where(uu=>uu.Id==id).IncludeWithDefaultProperties( l=> l.Task.Assignments,l=>l.Work));
                           cc.ExecuteQuery();
                           er.Assignments.Single(ll => ll.Id == id).Work = "9";
                           cc.Load(er);
                           cc.ExecuteQuery();
                           StatusAssignmentCollection sac = er.Assignments;
                            
                           sac.Update();
                           sac.SubmitAllStatusUpdates("hello vijay");

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vijay