You  have  attempted to dereference a scalar variable of type class  java.lang.String as a  structure with members

Hi

I receive the error in the title bar as a result of the following code but I can't see what I'm doing wrong:

<cfcomponent hint="sets background colour to help users see where they are during booking">

<cffunction name="cellcolour" returntype="struct">
<cfargument name="progressstage" type="string" required="true">
<cfset var stagecol="StructNew()">

<cfset oncolour="red">
<cfset offcolour="white">

<cfswitch expression="#progressstage#">
<cfcase value="progressstage1">
<cfset stagecol.colour1="#oncolour#">
<cfset stagecol.colour2="#offcolour#">
<cfset stagecol.colour3="#offcolour#">
<cfset stagecol.colour4="#offcolour#">
<cfset stagecol.colour5="#offcolour#">
</cfcase>

........... etc

Thew line where the error occurs is <cfset stagecol.colour1="#oncolour#">.

Thanks in advance for any advice

Dave