SSRS Subscription Error - Parameter takes a values that are not valid

Hi,

I am trying to set up subscriptions on one of my SSRS reports.

The input parameter is a integer. I would want it to take the current year in "YYYY" format 

I tried with the variable = Cint (DatePart("yyyy", Now)) which is giving me an error as attached.

I again tried with Cint(2012) to see if this works out. Unfortunately even this throws the same.

Appreciate if you could help me with this as I am new to subscriptions.

Thanks

Ram