I getting this error in rich:tree. my code is below.

            <rich:tree toggleType="ajax" var="item">

                                                           <rich:treeModelRecursiveAdaptor roots="#{provizyonBean.islemlerRoot}" nodes="#{item.children}" >

                                                                   <rich:treeNode>

                                                                      #{item.value}

                                                                   </rich:treeNode>

                                                           </rich:treeModelRecursiveAdaptor>

                                                  </rich:tree>

getIslemlerRoot() method returns a  List including a class type an that class have getChildren() method returning list of same type objects.

Can you help, please?