Wincc Flexible Faceplate-Structure Problem

Hi guys

I have a question about Wincc flexible Advance

I made a structure list with just 1 Data Type (bool) Then created a Faceplate and Defined a Property and

Used my Structure Data in it , after going back to Screen ,It wants a tag for "Dynamic interface" of faceplate and i defined a "bool tag" for and used that tag for a lamp.after running , program get error "Error : Invalid tag or tag missing for property of screen item 'Faceplate_4' in screen 'Screen_1'. "i think it says you cant use a bool tag for a structure data type !!!

but i watched all structure-faceplate videos on youtube and it worked without error !!For Example (https://www.youtube.com/watch?v=Kfec7627JnU)

plz help if you can . thank you so much

my Wincc flexible is 2008 SP5.