error IPickTreeItem when i select element

[nizarenis]

Hi, I use an IPickTreeItem to display some data, the IPickTreeItem display my data but when I select element I receive that error


this is my source Code
IPickTreeItem departmentItem = new IPickTreeItem(FieldsName.Pays,
TAMessages.getMessage("ta.ou.pays"));
departmentItem.setShowTitle(false);
departmentItem.setDataSource(CodePaysDS.getInstance());
departmentItem.setDisplayField(FieldsName.Pays);

is there any solution

[Isomorphic]

Please see the FAQ and the Debugging topic in the docs to understand what information you need to post in order to make it possible for people to help you.