Show Incident Category on a Problem form

Here is what I need:

If there is a problem that gets triggered from an Incident, I need an attribute to on the Problem form to show the Incident Category.FullName.  I thought this would do it but I'm getting errors when testing.  Any help?

importSystem
staticdefGetAttributeValue(Problem):
Value=""
      ifProblem.IncidentProblems.Incident.Category!=null:
           Value=Problem.IncidentProblems.Incident.Category.FullName
returnValue