Complex object types cannot be converted to simple values with a good path

   hi there 🙂

<cffile action='Write' file="#filename#" output='#data#' >

works fine with

<cfset filename = "\\fs-shared\shared$\biz\pre\#DateFormat(now(), "dd mmm yyyy hh mm ss")#.xml">

but with this

    <cfset filename = "c:\#DateFormat(now(), "dd mmm yyyy hh mm ss")#.xml">

I get this:

faultCode:Server.Processing  faultString:'Unable to invoke CFC - Complex object types cannot be  converted to simple values.' faultDetail:'The expression has requested a  variable or an intermediate expression result as a simple value.  However, the result cannot be converted to a simple value. Simple values  are strings, numbers, boolean values, and date/time values. Queries,  arrays, and COM objects are examples of complex values. <p> The  most likely cause of the error is that you tried to use a complex value  as a simple one. For example, you tried to use a query variable in a  cfif tag.'