Element ARRAYROLES is undefined in a CFML structure referenced as part of an expression.

Here's my code:

<cfif StructKeyExists(cfData.data[i], "inherited_roles") || IsArray(cfData.data[i].reader_roles)>  <cfset arrayRoles = "reader_roles" >  <cfif ArrayIsEmpty(cfData.data[i].inherited_roles)>  <cfset arrayRoles = "inherited_roles" >  </cfif>  <cfloop index="p" from="1" to="#arrayLen(cfData.data[i].arrayRoles)#">     <!---some code here--->  </cfloop></cfif>

And here's the error I kept getting.

Element ARRAYROLES is undefined in a CFML structure referenced as part of an expression.

The error occurred on line 07 when I have the #arrayLen(cfData.data[i].arrayRoles)#.

Any suggestion is much appreciated