Hey everyone,

I get this error thrown.  Any ideas?

Controller:

public class listTest{

private String[] selectedMakes = new String[]{};
private SelectOption[] availableList;
private SelectOption[] chosenList;
private String selectedTitle;
private String deSelectedTitle;
private static String MULTIPICKLIST_SEPERATOR = ';';

public ApexPages.StandardController MyProductController2 {get; set;}
public Product2 Product2 {get; set;}

public SelectOption[] getAvailableList(){
if (availableList == null) {
availableList = new SelectOption[]{};
List <Product2> pmakes = [Select Name, display_name__c, sku__c from Product2];
for (Product2 f : pmakes ) {
availableList.add(new SelectOption(f.sku__c, f.sku__c));
}
}

return availableList ;
}

public SelectOption[] getChosenList(){
if (chosenList== null) {
chosenList= new SelectOption[]{};
}
combineOptions(chosenList);
return chosenList;
}

private String combineOptions(List<SelectOption> values) {
String result = '';
for(SelectOption s: values) {
result = result + MULTIPICKLIST_SEPERATOR + s.getValue();
quote.es_nlp_makes__c = result;
}
return result;
}

public String getDeselectedTitle(){

deselectedTitle = 'Available';

return deselectedTitle;

}

public String getSelectedTitle(){

selectedTitle = 'Chosen';

return selectedTitle;

}
}