Object reference not set to an instance of an object

Hi Experts,

I am trying to open a file and i am coming up with the following error

Object reference not set to an instance of an object see 'ID = 95,

#2.0 #2011 12 20 16:13:17:831#-5:00#ERROR#ActionPane##EPM-BPC-MS##a88455f9-7ae5-40b2-9255-8940b26399f4###ActionPane::ChangeCV#WITHERS
shr########Plain##[LOG ID:974]System.NullReferenceException: Object reference not set to an instance of an object.

at OSoft.Consumers.Common.ActionPane50.ActionPane.PaneArrange()

at OSoft.Consumers.Common.ActionPane50.ActionPane.DoRefresh(String TargetPane, Boolean Reload, Int32 MenuID)

at OSoft.Consumers.Common.ActionPane50.ActionPane.ChangeCV()#

This is only happening with some users not all.

HHDJ