<cfinvoke> question

I am trying to call a web service and pass an array.
<cfset customerID = ArrayNew(1)>
<cfset customerID[1] = 1>
<cfset customerID[2] = 2>
<cfset customerID[3] = 3>
<cfset customerID[4] = 4>
<cfdump var="#customerID#">
<cfinvoke webservice="something.cfc?wsdl"
method = "getEmails" returnvariable="result">
<cfinvokeargument name="customerID" value="#customerID#">
</cfinvoke>

and on the something.cfc, i have
<cfargument name="customerID" type="array" required="true">

for some reason this call is returning the following error

Could not perform web service invocation "getOptOutEmails" because java.lang.IllegalArgumentException: argument type mismatch

if i use
<cfinvokeargument name="customerID" value="1"> </cfinvoke>
it works fine. what am i doing wrong ? thanks for the help in advance

That should work fine. Can you post the rest of the CFC that is receiving the web service call?

<cfcomponent displayname="...." hint="....">
<cffunction name="getEmails" access="remote" returntype="string">
<cfargument name="customerID" type="array" required="true">
<cfset custList = ArrayToList(CustomerID)>
<cfquery name="getEmailList" datasource="...">
SELECT emailAddress FROM Customer WHERE CustomerID in (<cfqueryparam value="#custList#" list="yes">)
</cfquery>
<cfset result = getEmails.emailAddress >
<cfreturn Result>
</cffunction>
</cfcomponent>

thanks for the help