hidden parameter

When i try to pass the hidden parameter p1 to my report i get the below
error.if you have come across such error please suggest the way around
"The report parameter 'p1' is read-only and cannot be modified"Your parameter is not hidded, but read only. You need to change its type
using Report Manager.
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"Satya" <bhatsatya@.gmail.com> wrote in message
news:1102360089.572689.142700@.c13g2000cwb.googlegroups.com...
> When i try to pass the hidden parameter p1 to my report i get the below
> error.if you have come across such error please suggest the way around
> "The report parameter 'p1' is read-only and cannot be modified"
>