Complex object types cannot be converted to simple values?

Hello,

I am a newbie to coldfusion attempting to list the contents of a directory and keep getting an error that reads Complex object types cannot be converted to simple values. The error is occurring on line 11, at .<cfloop collection="#picturelist#.  Any help would be greatly appreciated!

<cfset basefolder = "\\url\Corner_Reports" >          

<cfdirectory recurse="no" action="list" directory="#basefolder#" filter="*.pdf" name="picturelist">

<cfdump var="#picturelist#">      

<cfloop collection="#picturelist# " item="thefile">