a mystery.. need help

[Luinrandir Insight]

Hallo group.. any idea why this line is bad?
Lou


 foreach $v0(0 .. 150)
 {
        if ($Data[$v0] ne "")
        {
            $Data[$v0] = $form{Data($v0)}; <<<<<<<< this line is bad! ! ! !
!
        }
        print qq|Data($v0) = $Data[$v0]<BR>|;
 }
}