Can't load all properties of a remote object

Hi,
I have a java class called
Employe which has a field of type
Group(an java class)
when i get the Employe Object in flex using remote Object and
try to access Group's properties like
employe.goup.name, i get:
"Error #1009: Cannot access a property or method of a null
object reference".
Can some one please help me! Thank you.

Please check your Node Object, I mean all Objects that you are going to save is serialized or not.

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