Hi

I have a problem with my <rich:pickList> I can't display the items. When executing the application I got the following error:

java.lang.IllegalArgumentException: ValueBinding for UISelectMany : must be of type List or Array
 at org.richfaces.utils.PickListUtils.findUISelectManyConverter(PickListUtils.java:59)
 at org.richfaces.utils.PickListUtils.findUISelectManyConverterFailsafe(PickListUtils.java:79)

as the error message the selectItems is not a List but it is I can't understand!!.
I transmit to you my backing bean

@Stateful
@Name("adminAction")
@Scope(ScopeType.SESSION)
public class AdminActionBean implements AdminActionLocal {

@In(required=false)
 private List<String> customersChoice;
@Out(required=false)
 private List<String> companyNames;
@Factory("companyNames")
 public void selectCompanyNames(){
 setCompanyNames((List<String>) getEm().createQuery("select c.companyName from Customer c")
 .getResultList());

//getter() and settter......

my .xhtml page

<rich:pickList id="customersChoice" value="#{customersChoice}">
 <f:selectItems id="companyNames" value="#{companyNames}" />
 </rich:pickList>

Have you got any Idea? thanks for help
regards
bibou