No object is registered in context with Id

[Andrew Willerding]

I am stuck on exactly what this message means and how to correct the 
situation.

Here are my table relationships.
Project               ProjectContact         Contact
---------               --------------------         ----------
ProjectID <--->     ProjectID
                              ContactID    <--->  ContactID

Here is my code.

                ObjectContext oc = UI.getObjectContext();
                for (Contact item : list) {
                    ProjectContact newItem = 
oc.newObject(ProjectContact.class);
                    project.setObjectContext(oc);
                    project.getCompany().setObjectContext(oc);
                    newItem.setCompany(project.getCompany());
                    item.setObjectContext(oc);
exception->newItem.setContact(item);
                    newItem.setProject(project);
newItem.setPrimeContact(ProjectContact.Type.NON_PRIME.getCode());
                    addItemCount++;

Here's the exception that is thrown when the newItem.setContact(item) is 
executed.

2016-03-02,22:00:25:587,ERROR,[Thread-83],,'com.callistacti.vaadinLib.IWindowEditBase' 
ERROR:ObservableComponent Error processing observer's update code. 
Observer==>class 
com.itsurcom.bluecranex.GUI.Panels.PanelProjectContacts::org.apache.cayenne.CayenneRuntimeException: 
[v.4.0.M3 Feb 08 2016 17:09:41] No object is registered in context with 
Id <ObjectId:Contact, ContactID=1170>