Using " Set Object" throws Error

Hi All,

I am trying to automate Windows based application, already developed 200+ test cases..

We are tring to declare variable as object in top of the script as automation practice (just like we use to do it in UFT) ..

For eg: 

'Declare Public objects
Set objTradeTicket = Aliases.wndTradeDetails
Set objTradeTable = Aliases.javaw.starterMystageIndmsQaApplication.scene.primaryTabPane.tradesTable
Set Yes_Btn = Aliases.javaw.heavyweightdialog1ConfirmClose.scene.buttonbar.buttonYes
Set objProductTab = Aliases.javaw.starterMystageIndmsQaApplication.scene.primaryTabPane.filterByProductTabs

Here the problem is i am just declaring the variable object on top of the script and these objects will be used in the script later on after few operations, once i execute the code Test complete immidiately throws ERROR(Obj does not exist)..

Can anyone please suggest solution on this please?

Thanks,

Kavan Shah