BusinessRules.CheckRules() throwing 'Object reference not set to an instance of an object'

[Chicagoan2016]

We have a Csla 4.xx project. One of our parent objects (that has 'child'objects ) is throwing the above error in BusinessBase.DataPortal_Create()
I have the following stack trace

      BusinessRules.RunRules(IEnumerable`1 rules, Boolean cascade, RuleContextModes 
      executionContext) line 739
      BusinessRules.CheckRulesForProperty(IPropertyInfo property, Boolean cascade, RuleContextModes 
      executionContext) line 573
      BusinessRules.CheckRules(IPropertyInfo property, RuleContextModes executionContext) line 522
      BusinessRules.CheckRules() line 421
      BusinessBase.DataPortal_Create() line 1313

Kind Regards

[rockfordlhotka]

That doesn't provide the actual exceeption though.

[Chicagoan2016]

@rockfordlhotka
I narrowed it down to
{"Property load or set failed for property EmployeeID (Object reference not set to an instance of an object.)"}

[Chicagoan2016]

@rockfordlhotka We have inheritance in the object graph where EmployeeID is a property of abstract base class.
We only have business properties and AddBusinessRules method is our abstract base class (always have been the same).
Do we need to change our abstract base class?

[Chicagoan2016]

In our concrete object the base.DataPortal_Create() is throwing the Object reference not set to an instance of a reference object.
The base in our concrete class referes to the abstract base class (that has only properties and AddBusinessRules).
It's not initializing all of a sudden. It was working I promise : )

[Chicagoan2016]

It was an error in our business rules using Priorities, A business rule with lower priority was called which I thought shouldn't be the case. I am going to start another thread.