NX 8.0 throwing error while saving , even though the assembly is getting saved using (NXOpen) ?

[biw01]

Hello All,

I am getting this weird error after saving my assembly part using NXOpen.
"invalid part tag"

Please help !!!

When i looked into the NX Log File , I am seeing the following exception message
EXCEPTION: Error code 641018 in line 2026 of O:\ugnx80\ip25\src\part\no\ind\part.c
+++ Part corresponding to tag 0 is NULL

I am using the following function to save the full assembly

        Dim partSaveStatus1 As PartSaveStatus
        partSaveStatus1 = FnGetNxSession.Parts.Work.Save(BasePart.SaveComponents.True, BasePart.CloseAfterSave.False)
        partSaveStatus1.Dispose()

Thanks,
Amitabh