pref error handling update
pref error handling update

brunyuriy/crystalvc,brunyuriy/crystalvc,KaranDagar/FSE-2011-Crystal---old,SoftwareEngineeringToolDemos/FSE-2011-Crystal,KaranDagar/crystalvc,KaranDagar/FSE-2011-Crystal---old,SoftwareEngineeringToolDemos/FSE-2011-Crystal,SoftwareEngineeringToolDemos/FSE-2011-Crystal,KaranDagar/crystalvc