>hi,
>Hmmm, are you sure you put it in the Header's section of the report?sure 100%
>
>i try it ,same error message...
>
>what is the different between lcEditValue and pcEditValue(lc and pc)
>
>thanks

I'm not sure what has gone wrong, but at this point I would probably start over this report and try to recreate it.

Try to make the same report again and see if the problem re-appears.

Christof already answered the question about differences.