multiple select in look up for SSRS

Hi guys!!!

I am trying to make lookup with multiple select in SSRS with RDP i tried to follow this article but but getting an error

if some one has any idea please help thanks…

i followd this but getting error and getting the desired output thanks…

http://ssrsax.blogspot.in/2012/05/creating-multi-select-lookup-dialog-for.html

rohit